Added method map to Collection interface and all its implementations (except classes generated fr...

client/html/src/NodeWrappingImplementation.dart

Index: client/html/src/NodeWrappingImplementation.dart
===================================================================
--- client/html/src/NodeWrappingImplementation.dart	(revision 3161)
+++ client/html/src/NodeWrappingImplementation.dart	(working copy)
@@ -25,6 +25,14 @@
 
   void forEach(void f(Node element)) => _toList().forEach(f);
 
+  Collection map(f(Node element)) {
+    List output = new List();
+    forEach((Node element) {
+        output.add(f(element));
+    });
+    return output;
+  }
+
   Collection<Node> filter(bool f(Node element)) {
     List<Node> output = new List<Node>();
     forEach((Node element) {