feat(Directive): convert properties to an array

fixes #2013

BREAKING CHANGE:

Before

    @Directive(properties: {
      'sameName': 'sameName',
      'directiveProp': 'elProp | pipe'
    })

After

    @Directive(properties: [
      'sameName',
      'directiveProp: elProp | pipe'
    ])

modules/angular2/test/test_lib/test_component_builder_spec.ts

@@ -43,7 +43,7 @@ class Logger {
   add(thing: string) { ListWrapper.push(this.log, thing); }
 }
 
-@Directive({selector: '[message]', properties: {'message': 'message'}})
+@Directive({selector: '[message]', properties: ['message']})
 @Injectable()
 class MessageDir {
   logger: Logger;