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

src/diagrams/tutorials/fetchdata/callback.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>139.17.0.185490</string>
+                <string>139.18.0.187838</string>
         </array>
         <key>AutoAdjust</key>
         <true/>
         <key>BackgroundGraphic</key>
         <dict>
                 <key>Bounds</key>
                 <string>{{0, 0}, {576, 733}}</string>
                 <key>Class</key>
                 <string>SolidGraphic</string>
                 <key>ID</key>
@@ skipping 86 matching lines @@
                                 <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 ...\
 requestComplete(HttpRequest request) \{\
   if (request.status == 200) \{\
-    List&lt;String&gt; portmanteaux = json.parse(request.responseText);\
+    List&lt;String&gt; portmanteaux = JSON.decode(request.responseText);\
     for (int i = 0; i &lt; portmanteaux.length; i++) \{\
       wordList.children.add(new LIElement()..text = portmanteaux[i]);\
     \}\
   \} else \{\
     wordList.children.add(new LIElement()..text =\
         'Request failed, status=\{$request.status\}');\
   \}\
 \}}</string>
                                 <key>VerticalPad</key>
                                 <integer>2</integer>
                         </dict>
                         <key>Wrap</key>
                         <string>NO</string>
                 </dict>
                 <dict>
                         <key>Class</key>
                         <string>LineGraphic</string>
                         <key>Head</key>
                         <dict>
                                 <key>ID</key>
                                 <integer>34214</integer>
                         </dict>
                         <key>ID</key>
                         <integer>34216</integer>
                         <key>Points</key>
                         <array>
-                                <string>{224.67445421054754, 343.28305053710938}</string>
-                                <string>{182.19128944518698, 375}</string>
+                                <string>{224.67445419993294, 343.28305053710938}</string>
+                                <string>{182.19128942162382, 375}</string>
                         </array>
                         <key>Style</key>
                         <dict>
                                 <key>stroke</key>
                                 <dict>
                                         <key>HeadArrow</key>
                                         <string>FilledArrow</string>
                                         <key>Legacy</key>
                                         <true/>
                                         <key>TailArrow</key>
@@ skipping 563 matching lines @@
                         <string>LineGraphic</string>
                         <key>Head</key>
                         <dict>
                                 <key>ID</key>
                                 <integer>34165</integer>
                         </dict>
                         <key>ID</key>
                         <integer>34199</integer>
                         <key>Points</key>
                         <array>
-                                <string>{448.64125637288817, 343.28305053710938}</string>
-                                <string>{428.25436314596851, 389.28305053710938}</string>
+                                <string>{449.99255583221611, 343.28305053710938}</string>
+                                <string>{436.14879682941046, 389.28305053710938}</string>
                         </array>
                         <key>Style</key>
                         <dict>
                                 <key>stroke</key>
                                 <dict>
                                         <key>HeadArrow</key>
                                         <string>FilledArrow</string>
                                         <key>Legacy</key>
                                         <true/>
                                         <key>TailArrow</key>
                                         <string>0</string>
                                 </dict>
                         </dict>
                         <key>Tail</key>
                         <dict>
                                 <key>ID</key>
                                 <integer>34198</integer>
                         </dict>
                 </dict>
                 <dict>
                         <key>Bounds</key>
-                        <string>{{355.20318603515625, 389.28305053710938}, {143, 14}}</string>
+                        <string>{{355.20318603515625, 389.28305053710938}, {159.79681396484375, 14}}</string>
                         <key>Class</key>
                         <string>ShapedGraphic</string>
                         <key>ID</key>
                         <integer>34165</integer>
                         <key>Magnets</key>
                         <array>
                                 <string>{0.38387096774193563, -0.25}</string>
                                 <string>{0, 0.25}</string>
                                 <string>{0, -0.25000000000000355}</string>
                         </array>
@@ skipping 132 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>2013-06-24 16:55:37 +0000</string>
+        <string>2013-10-10 17:03:36 +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>