nav and modal docs wip

ionic/components/nav/nav-push.ts

@@ -1,7 +1,9 @@
 import {Directive} from 'angular2/angular2';
 import {NavController} from './nav-controller';
 
-
+/**
+ * TODO
+ */
 @Directive({
   selector: '[nav-push]',
   properties: [
@@ -14,15 +16,22 @@ import {NavController} from './nav-controller';
   }
 })
 export class NavPush {
+  /**
+   * TODO
+   * @param {NavController} nav  TODO
+   */
   constructor(nav: NavController) {
     this.nav = nav;
   }
+
   onClick(event) {
     this.nav.push(this.navPush, this.pushData);
   }
 }
 
-
+/**
+ * TODO
+ */
 @Directive({
   selector: '[nav-pop]',
   host: {
@@ -31,6 +40,10 @@ export class NavPush {
   }
 })
 export class NavPop {
+  /**
+   * TODO
+   * @param {NavController} nav  TODO
+   */
   constructor(nav: NavController) {
     this.nav = nav;
   }