feat(core): add support for @Property and @Event decorators

Example:

@Directive({selector: 'my-selector'})
class MyDirective {
  @Property() prop;
  @Property('el-prop') prop2;
  @Event() event;
  @Event('el-event') event2;
}

Closes #3992

modules/angular2/src/core/reflection/reflection.dart

@@ -27,6 +27,10 @@ class NoReflectionCapabilities implements PlatformReflectionCapabilities {
     throw "Cannot find reflection information on ${stringify(type)}";
   }
 
+  Map propMetadata(Type type) {
+    throw "Cannot find reflection information on ${stringify(type)}";
+  }
+
   GetterFn getter(String name) {
     throw "Cannot find getter ${name}";
   }