docs: create public API surface

Closes #1181

modules/angular2/change_detection.js

@@ -39,6 +39,10 @@ export var defaultPipes = {
   ]
 };
 
+
+/**
+ * @publicModule angular2/change_detection
+ */
 export class DynamicChangeDetection extends ChangeDetection {
   registry:PipeRegistry;
 
@@ -52,6 +56,9 @@ export class DynamicChangeDetection extends ChangeDetection {
   }
 }
 
+/**
+ * @publicModule angular2/change_detection
+ */
 export class JitChangeDetection extends ChangeDetection {
   registry:PipeRegistry;