Update polymer tutorial; make directory paths match new sample structure

src/diagrams/tutorials/polymer-intro/dart-script-code.graffle

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
         <key>ActiveLayerIndex</key>
         <integer>0</integer>
         <key>ApplicationVersion</key>
         <array>
                 <string>com.omnigroup.OmniGrafflePro</string>
                 <string>139.18.0.187838</string>
@@ skipping 35 matching lines @@
         <key>Creator</key>
         <string>Mary Campione</string>
         <key>DisplayScale</key>
         <string>1 0/72 in = 1.0000 in</string>
         <key>GraphDocumentVersion</key>
         <integer>8</integer>
         <key>GraphicsList</key>
         <array>
                 <dict>
                         <key>Bounds</key>
-                        <string>{{346, 104.5}, {356, 290}}</string>
+                        <string>{{346, 104.5}, {356, 304}}</string>
                         <key>Class</key>
                         <string>ShapedGraphic</string>
                         <key>FitText</key>
                         <string>YES</string>
                         <key>Flow</key>
                         <string>Resize</string>
                         <key>ID</key>
                         <integer>34187</integer>
                         <key>Shape</key>
                         <string>Rectangle</string>
@@ skipping 13 matching lines @@
                                 <dict>
                                         <key>CornerRadius</key>
                                         <real>7</real>
                                 </dict>
                         </dict>
                         <key>Text</key>
                         <dict>
                                 <key>Align</key>
                                 <integer>0</integer>
                                 <key>Text</key>
-                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf400
+                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1265\cocoasubrtf200
 \cocoascreenfonts1{\fonttbl\f0\fmodern\fcharset0 CourierNewPSMT;}
 {\colortbl;\red255\green255\blue255;}
 \deftab720
 \pard\pardeftab720
 
 \f0\fs24 \cf0 import 'dart:html';\
 import 'dart:async';\
 import 'package:polymer/polymer.dart';\
 \
 @CustomTag('tute-stopwatch')\
 class TuteStopwatch extends PolymerElement \{\
-\pard\pardeftab720
-\cf0   @observable String counter='00:00';\
-\pard\pardeftab720
-\cf0 \
+  @observable String counter='00:00';\
+\
   TuteStopwatch.created() : super.created();\
-\
+  ...\
   @override\
-  void enteredView() \{\
-    super.enteredView();\
+  void attached() \{\
+    super.attached();\
     ...\
   \}\
-\
+  ...\
   void start(Event e, var detail, Node target) \{\
     ...\
   \}  \
+  ...\
 \}}</string>
                         </dict>
                         <key>Wrap</key>
                         <string>NO</string>
                 </dict>
                 <dict>
                         <key>Class</key>
                         <string>LineGraphic</string>
                         <key>Head</key>
                         <dict>
                                 <key>ID</key>
                                 <integer>34201</integer>
                         </dict>
                         <key>ID</key>
                         <integer>34204</integer>
                         <key>Points</key>
                         <array>
-                                <string>{322, 347.98744514855662}</string>
-                                <string>{363, 348.56170402927751}</string>
+                                <string>{322, 348.08771972195029}</string>
+                                <string>{363, 348.72029431202066}</string>
                         </array>
                         <key>Style</key>
                         <dict>
                                 <key>stroke</key>
                                 <dict>
                                         <key>HeadArrow</key>
                                         <string>FilledArrow</string>
                                         <key>Legacy</key>
                                         <true/>
                                         <key>TailArrow</key>
@@ skipping 11 matching lines @@
                         <string>LineGraphic</string>
                         <key>Head</key>
                         <dict>
                                 <key>ID</key>
                                 <integer>34158</integer>
                         </dict>
                         <key>ID</key>
                         <integer>34203</integer>
                         <key>Points</key>
                         <array>
-                                <string>{322, 280.69319665572368}</string>
-                                <string>{363, 281.2292666393891}</string>
+                                <string>{322, 280.75687377282782}</string>
+                                <string>{363, 281.31310407928294}</string>
                         </array>
                         <key>Style</key>
                         <dict>
                                 <key>stroke</key>
                                 <dict>
                                         <key>HeadArrow</key>
                                         <string>FilledArrow</string>
                                         <key>Legacy</key>
                                         <true/>
                                         <key>TailArrow</key>
@@ skipping 38 matching lines @@
                                 <dict>
                                         <key>Draws</key>
                                         <string>NO</string>
                                 </dict>
                         </dict>
                         <key>Text</key>
                         <dict>
                                 <key>Align</key>
                                 <integer>2</integer>
                                 <key>Text</key>
-                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf400
+                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1265\cocoasubrtf200
 \cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
 {\colortbl;\red255\green255\blue255;}
 \pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qr
 
 \f0\fs24 \cf0 Define an event handler}</string>
                         </dict>
                 </dict>
                 <dict>
                         <key>Bounds</key>
                         <string>{{363, 329.5}, {339, 44.5}}</string>
@@ skipping 61 matching lines @@
                                 <dict>
                                         <key>Draws</key>
                                         <string>NO</string>
                                 </dict>
                         </dict>
                         <key>Text</key>
                         <dict>
                                 <key>Align</key>
                                 <integer>2</integer>
                                 <key>Text</key>
-                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf400
+                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1265\cocoasubrtf200
 \cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
 {\colortbl;\red255\green255\blue255;}
 \pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qr
 
 \f0\fs24 \cf0 Override a custom element life-cycle method}</string>
                         </dict>
                 </dict>
                 <dict>
                         <key>Bounds</key>
                         <string>{{363, 248}, {157, 69}}</string>
@@ skipping 76 matching lines @@
                                         <string>NO</string>
                                 </dict>
                         </dict>
                         <key>Text</key>
                         <dict>
                                 <key>Align</key>
                                 <integer>0</integer>
                                 <key>Pad</key>
                                 <integer>2</integer>
                                 <key>Text</key>
-                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf400
+                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1265\cocoasubrtf200
 \cocoascreenfonts1{\fonttbl\f0\fnil\fcharset0 HelveticaNeue;}
 {\colortbl;\red255\green255\blue255;\red128\green0\blue0;}
 \pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural
 
 \f0\i\b\fs28 \cf2 Save to $tutorial/polymer/images/dart-script-code.png}</string>
                                 <key>VerticalPad</key>
                                 <integer>2</integer>
                         </dict>
                         <key>Wrap</key>
                         <string>NO</string>
@@ skipping 37 matching lines @@
                         <string>LineGraphic</string>
                         <key>Head</key>
                         <dict>
                                 <key>ID</key>
                                 <integer>34175</integer>
                         </dict>
                         <key>ID</key>
                         <integer>34182</integer>
                         <key>Points</key>
                         <array>
-                                <string>{322, 167.96119325331551}</string>
-                                <string>{350, 168.75556547538793}</string>
+                                <string>{322, 167.96282984822122}</string>
+                                <string>{350, 168.7575776822392}</string>
                         </array>
                         <key>Style</key>
                         <dict>
                                 <key>stroke</key>
                                 <dict>
                                         <key>HeadArrow</key>
                                         <string>FilledArrow</string>
                                         <key>Legacy</key>
                                         <true/>
                                         <key>TailArrow</key>
@@ skipping 144 matching lines @@
                                         <string>NO</string>
                                 </dict>
                         </dict>
                         <key>Text</key>
                         <dict>
                                 <key>Align</key>
                                 <integer>2</integer>
                                 <key>Pad</key>
                                 <integer>2</integer>
                                 <key>Text</key>
-                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf400
+                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1265\cocoasubrtf200
 \cocoascreenfonts1{\fonttbl\f0\fnil\fcharset0 HelveticaNeue;}
 {\colortbl;\red255\green255\blue255;}
 \pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qr
 
 \f0\fs24 \cf0 Extend PolymerElement}</string>
                                 <key>VerticalPad</key>
                                 <integer>2</integer>
                         </dict>
                         <key>Wrap</key>
                         <string>NO</string>
@@ skipping 30 matching lines @@
                                 <dict>
                                         <key>Draws</key>
                                         <string>NO</string>
                                 </dict>
                         </dict>
                         <key>Text</key>
                         <dict>
                                 <key>Align</key>
                                 <integer>2</integer>
                                 <key>Text</key>
-                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf400
+                                <string>{\rtf1\ansi\ansicpg1252\cocoartf1265\cocoasubrtf200
 \cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
 {\colortbl;\red255\green255\blue255;}
 \pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qr
 
 \f0\fs24 \cf0 Associate this class with a custom element}</string>
                         </dict>
                 </dict>
         </array>
         <key>GridInfo</key>
         <dict/>
@@ skipping 35 matching lines @@
                 <key>twopiSeparation</key>
                 <real>0.0</real>
         </dict>
         <key>LinksVisible</key>
         <string>NO</string>
         <key>MagnetsVisible</key>
         <string>NO</string>
         <key>MasterSheets</key>
         <array/>
         <key>ModificationDate</key>
-        <string>2013-10-30 16:12:32 +0000</string>
+        <string>2014-05-29 18:39:08 +0000</string>
         <key>Modifier</key>
-        <string>Mary Campione</string>
+        <string>Kathy Walrath</string>
         <key>NotesVisible</key>
         <string>NO</string>
         <key>Orientation</key>
         <integer>2</integer>
         <key>OriginVisible</key>
         <string>NO</string>
         <key>PageBreaks</key>
         <string>YES</string>
         <key>PrintInfo</key>
         <dict>
@@ skipping 58 matching lines @@
                 <key>CurrentSheet</key>
                 <integer>0</integer>
                 <key>ExpandedCanvases</key>
                 <array>
                         <dict>
                                 <key>name</key>
                                 <string>Canvas 1</string>
                         </dict>
                 </array>
                 <key>Frame</key>
-                <string>{{421, 700}, {1171, 878}}</string>
+                <string>{{1250, 606}, {1171, 878}}</string>
                 <key>ListView</key>
                 <true/>
                 <key>OutlineWidth</key>
                 <integer>142</integer>
                 <key>RightSidebar</key>
                 <true/>
                 <key>ShowRuler</key>
                 <true/>
                 <key>Sidebar</key>
                 <false/>
                 <key>SidebarWidth</key>
                 <integer>120</integer>
                 <key>VisibleRegion</key>
                 <string>{{0, 0}, {1000, 724}}</string>
                 <key>Zoom</key>
                 <real>1</real>
                 <key>ZoomValues</key>
                 <array>
                         <array>
                                 <string>Canvas 1</string>
                                 <real>1</real>
                                 <real>1</real>
                         </array>
                 </array>
         </dict>
 </dict>
 </plist>