feat(Directive): Have a single Directive.host which mimics HTML

fixes #2268

BREAKING CHANGE:

Before

    @Directive({
      hostListeners: {'event': 'statement'},
      hostProperties: {'expression': 'hostProp'},
      hostAttributes: {'attr': 'value'},
      hostActions: {'action': 'statement'}
    })

After

    @Directive({
      host: {
        '(event)': 'statement',
        '[hostProp]': 'expression'  // k & v swapped
        'attr': 'value',
        '@action': 'statement'
      }
    })

modules/angular2/test/forms/integration_spec.ts

@@ -733,8 +733,7 @@ export function main() {
 
 @Directive({
   selector: '[wrapped-value]',
-  hostListeners: {'change': 'handleOnChange($event.target.value)'},
-  hostProperties: {'value': 'value'}
+  host: {'(change)': 'handleOnChange($event.target.value)', '[value]': 'value'}
 })
 class WrappedValue implements ControlValueAccessor {
   value;