feat(change_detection): added onInit and onCheck hooks

modules/angular2/src/core/compiler/interfaces.ts

@@ -11,6 +11,16 @@ export interface OnChange { onChange(changes: StringMap<string, any>): void; }
  */
 export interface OnDestroy { onDestroy(): void; }
 
+/**
+ * Defines lifecycle method [onCheck] called when a directive is being checked.
+ */
+export interface OnCheck { onCheck(): void; }
+
+/**
+ * Defines lifecycle method [onInit] called when a directive is being checked the first time.
+ */
+export interface OnInit { onInit(): void; }
+
 /**
  * Defines lifecycle method [onAllChangesDone ] called when the bindings of all its children have
  * been changed.