update polymer, nodebind, and templatebinding

pkg/polymer/lib/src/build/script_compactor.dart

Index: pkg/polymer/lib/src/build/script_compactor.dart
diff --git a/pkg/polymer/lib/src/build/script_compactor.dart b/pkg/polymer/lib/src/build/script_compactor.dart
index b633360cb27610da7432724910bb1394b32d6a52..7139722670fb1009060c71c3f64ab3e3aec1f7c3 100644
--- a/pkg/polymer/lib/src/build/script_compactor.dart
+++ b/pkg/polymer/lib/src/build/script_compactor.dart
@@ -506,20 +506,24 @@ class _HtmlExtractor extends TreeVisitor {
             tag == 'textarea' && name == 'value');
       }
       for (var exp in bindings.expressions) {
-        _addExpression(exp, isEvent, isTwoWay);
+        _addExpression(exp, isEvent, isTwoWay, node.sourceSpan);
       }
     });
   }
 
-  void _addExpression(String stringExpression, bool inEvent, bool isTwoWay) {
+  void _addExpression(String stringExpression, bool inEvent, bool isTwoWay,
+      SourceSpan span) {
+
     if (inEvent) {
-      if (!stringExpression.startsWith("@")) {
-        if (stringExpression == '') return;
-        generator.addGetter(stringExpression);
-        generator.addSymbol(stringExpression);
+      if (stringExpression.startsWith('@')) {
+        logger.warning('event bindings with @ are no longer supported',
+            span: span);
         return;
       }
-      stringExpression = stringExpression.substring(1);
+
+      if (stringExpression == '') return;
+      generator.addGetter(stringExpression);
+      generator.addSymbol(stringExpression);
     }
     visitor.run(pe.parse(stringExpression), isTwoWay);
   }
@@ -701,7 +705,7 @@ List<ClassElement> _visibleClassesOf(LibraryElement lib) {
 
 /// Retrieves all top-level methods that are visible if you were to import
 /// [lib]. This includes exported methods from other libraries too.
-List<ClassElement> _visibleTopLevelMethodsOf(LibraryElement lib) {
+List<FunctionElement> _visibleTopLevelMethodsOf(LibraryElement lib) {
   var result = [];
   result.addAll(lib.units.expand((u) => u.functions));
   for (var e in lib.exports) {