refactor(LifecycleEvent): remove LifecycleEvent

fixes #3924

BREAKING CHANGE

The `lifecycle` configuration for directive has been dropped.

Before

    // Dart
    @Component({lifecycle: const [LifecycleEvent.OnChanges], ...})
    class MyComponent implements OnChanges {
      void onChanges() {...}
    }

    // Typescript
    @Component({lifecycle: [LifecycleEvent.OnChanges], ...})
    class MyComponent implements OnChanges {
      onChanges(): void {...}
    }

    // ES5
    var MyComponent = ng.
    Component({lifecycle: [LifecycleEvent.OnChanges], ...}).
    Class({
      onChanges: function() {...}
    });

After

    // Dart
    @Component({...})
    class MyComponent implements OnChanges {
      void onChanges() {...}
    }

    // Typescript
    @Component({...})
    class MyComponent implements OnChanges {
      onChanges(): void {...}
    }

    // ES5
    var MyComponent = ng
      .Component({...})
      .Class({
        onChanges: function() {
        }
      });

modules/angular2_material/src/components/progress-linear/progress_linear.ts

@@ -1,9 +1,15 @@
-import {Component, LifecycleEvent, View, ViewEncapsulation, Attribute} from 'angular2/angular2';
+import {
+  Component,
+  LifecycleEvent,
+  View,
+  ViewEncapsulation,
+  Attribute,
+  OnChanges
+} from 'angular2/angular2';
 import {CONST} from 'angular2/src/core/facade/lang';
 import {isPresent, isBlank} from 'angular2/src/core/facade/lang';
 import {Math} from 'angular2/src/core/facade/math';
 
-
 /** Different display / behavior modes for progress-linear. */
 @CONST()
 class ProgressMode {
@@ -15,7 +21,6 @@ class ProgressMode {
 
 @Component({
   selector: 'md-progress-linear',
-  lifecycle: [LifecycleEvent.OnChanges],
   properties: ['value', 'bufferValue'],
   host: {
     'role': 'progressbar',
@@ -29,7 +34,7 @@ class ProgressMode {
   directives: [],
   encapsulation: ViewEncapsulation.None
 })
-export class MdProgressLinear {
+export class MdProgressLinear implements OnChanges {
   /** Value for the primary bar. */
   value_: number;