feat(reflector): added a method to get type's interfaces

modules/angular2/src/reflection/reflection_capabilities.ts

@@ -1,4 +1,4 @@
-import {Type, isPresent, global, stringify} from 'angular2/src/facade/lang';
+import {Type, isPresent, global, stringify, BaseException} from 'angular2/src/facade/lang';
 import {List, ListWrapper} from 'angular2/src/facade/collection';
 import {GetterFn, SetterFn, MethodFn} from './types';
 
@@ -97,6 +97,10 @@ export class ReflectionCapabilities {
     return [];
   }
 
+  interfaces(type): List<any> {
+    throw new BaseException("JavaScript does not support interfaces");
+  }
+
   getter(name: string): GetterFn { return new Function('o', 'return o.' + name + ';'); }
 
   setter(name: string): SetterFn { return new Function('o', 'v', 'return o.' + name + ' = v;'); }