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/benchmarks/src/tree/tree_benchmark.js

@@ -242,7 +242,7 @@ class AppComponent {
 
 @Component({
   selector: 'tree',
-  properties: {'data': 'data'}
+  properties: ['data']
 })
 @View({
   directives: [TreeComponent, NgIf],