fix templates after alpha50

ionic/components/button/button.ts

@@ -60,7 +60,7 @@ export class Button {
     this._readIcon(element);
   }
 
-  afterContentInit() {
+  ngAfterContentInit() {
     this._assignCss(true);
   }
 

ionic/components/nav/test/routing/view2.html

@@ -5,7 +5,7 @@
     <button>
       <icon help></icon>
     </button>
-  </ion-nav-item>
+  </ion-buttons>
 </ion-navbar>
 
 <ion-content padding>

ionic/components/text-input/test/form-inputs/main.html

@@ -4,7 +4,7 @@
 
 <ion-content>
 
-  <form (ng-submit)="submit($event)" [ng-form-model]="loginForm" #mf="form" novalidate>
+  <form (ng-submit)="submit($event)" [ng-form-model]="loginForm" #mf="ngForm" novalidate>
 
     <ion-list>
       <ion-input>

ionic/components/text-input/test/inset-inputs/main.html

@@ -46,7 +46,7 @@
       <icon search item-left></icon>
       <input value="Inset input inside a list" type="text">
       <button outline item-right>Search</button>
-    </ion-input inset>
+    </ion-input>
 
   </ion-list>