removing Web UI tutorials, updating remaining 4 to current release, + review pass

src/diagrams/tutorials/polymer-intro/one-way-data-binding.graffle/data.plist

 <?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 215 matching lines @@
                                 </dict>
                                 <key>stroke</key>
                                 <dict>
                                         <key>Draws</key>
                                         <string>NO</string>
                                 </dict>
                         </dict>
                 </dict>
                 <dict>
                         <key>Bounds</key>
-                        <string>{{41, 317}, {479, 178}}</string>
+                        <string>{{41, 317}, {327, 178}}</string>
                         <key>Class</key>
                         <string>ShapedGraphic</string>
                         <key>FitText</key>
                         <string>YES</string>
                         <key>Flow</key>
                         <string>Resize</string>
                         <key>FontInfo</key>
                         <dict>
                                 <key>Font</key>
                                 <string>HelveticaNeue</string>
@@ skipping 27 matching lines @@
                                 <key>Align</key>
                                 <integer>0</integer>
                                 <key>Text</key>
                                 <string>{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf390
 \cocoascreenfonts1{\fonttbl\f0\fmodern\fcharset0 CourierNewPSMT;}
 {\colortbl;\red255\green255\blue255;}
 \deftab720
 \pard\pardeftab720
 
 \f0\fs24 \cf0 @CustomTag('tute-stopwatch')\
-class TuteStopwatch extends PolymerElement with ObservableMixin \{\
+class TuteStopwatch extends PolymerElement \{\
 \
   @observable String counter = '00:00';\
 \
   void updateTime(Timer _) \{\
     ...\
     counter = '$minute:$second';\
   \}\
 \
 ...\
 \}}</string>
@@ skipping 381 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>2013-10-09 20:43:56 +0000</string>
+        <string>2013-10-10 16:35:51 +0000</string>
         <key>Modifier</key>
         <string>Mary Campione</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>
@@ skipping 88 matching lines @@
                 <array>
                         <array>
                                 <string>Canvas 1</string>
                                 <real>1</real>
                                 <real>1</real>
                         </array>
                 </array>
         </dict>
 </dict>
 </plist>