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

src/site/docs/tutorials/indexeddb/examples/count_down/out/web/xmilestone.dart

Index: src/site/docs/tutorials/indexeddb/examples/count_down/out/web/xmilestone.dart
diff --git a/src/site/docs/tutorials/indexeddb/examples/count_down/out/web/xmilestone.dart b/src/site/docs/tutorials/indexeddb/examples/count_down/out/web/xmilestone.dart
deleted file mode 100644
index 5a5593096e38b5be75e34d61084ed6e7baeac4bf..0000000000000000000000000000000000000000
--- a/src/site/docs/tutorials/indexeddb/examples/count_down/out/web/xmilestone.dart
+++ /dev/null
@@ -1,41 +0,0 @@
-import 'package:polymer/polymer.dart';
-import 'milestone.dart';
-import 'count_down.dart';
-import 'dart:html';
-
-@CustomTag('x-milestone')
-class MilestoneComponent extends PolymerElement {
-  @observable Milestone get milestone => __$milestone; Milestone __$milestone; set milestone(Milestone value) { __$milestone = notifyPropertyChange(#milestone, __$milestone, value); }
-  @observable String _displayString = '';
-    
-  // xx: Internationalize this.
-  //getters aren't automatically observed...so moved this method into the milestone object
-  //and observe that instead.
-  @observable String get timeRemainingAsString { 
-    if (milestone.elapsed) {
-      _displayString = 'Huzzah for ${milestone.milestoneName}!';
-      return _displayString;
-    }
-    
-    // Calculate days, hours, and minutes remaining.
-    Duration timeRemaining = milestone.timeRemaining;
-    
-    int d = timeRemaining.inDays;
-    int h = timeRemaining.inHours.remainder(Duration.HOURS_PER_DAY);
-    int m = timeRemaining.inMinutes.remainder(Duration.MINUTES_PER_HOUR);
-    int s = timeRemaining.inSeconds.remainder(Duration.SECONDS_PER_MINUTE);
-    
-    // Format individual pieces of the display string.
-    String days = (d == 0) ? '' : '$d days, ';
-    String hours = (h == 0) ? '' : '$h hours, ';
-    String minutes = (m == 0) ? '' : '$m minutes, ';
-    String seconds = '$s seconds';
-    
-    _displayString = '$days $hours $minutes $seconds until ${milestone.milestoneName}';
-    return _displayString;
-  }
-
-  void removeMilestone(Event e, var detail, Node target) {
-    appObject.removeMilestone(milestone);
-  }
-}