chore: rename for to ng-for

Closes #1598
Closes #1295
Closes #1827

Closes #1827

modules/examples/src/forms/index.es6

@@ -135,7 +135,7 @@ class SurveyQuestion {
 
       <button (click)="addQuestion()">Add Question</button>
       <survey-question
-          *for="var q of form.controls.questions.controls; var i=index"
+          *ng-for="var q of form.controls.questions.controls; var i=index"
           [question]="q"
           [index]="i + 1"
           (destroy)="destroyQuestion(i)">

modules/examples/src/todo/todo.html

@@ -18,7 +18,7 @@
 
     <ul id="todo-list">
 
-      <li *for="#todo of todoStore.list">
+      <li *ng-for="#todo of todoStore.list">
 
         <div class="view"
             [class.hidden]="todoEdit == todo">