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/examples/src/material/dialog/index.js

@@ -62,7 +62,7 @@ class DemoApp {
 
 @Component({
   selector: 'simple-dialog',
-  properties: {'numCoconuts': 'numCoconuts'}
+  properties: ['numCoconuts']
 })
 @View({
   template: `