title: *ngIf on Ionic 2 not work with binding
body: <p>I'm Trying to hide/show elements of a <code>ion-list</code> depending of a boolean variable which is changed when a button is clicked.</p>
  
  <p>The problem is that if I try with <code>*ngIf="{{editMode}}"</code> the <code>ionic serve --lab</code> shows blank screen on browser.</p>
  
  <pre><code>&lt;ion-item-sliding *ngFor="let item of items" (click)="itemTapped($event, item)"&gt;
        &lt;ion-item&gt;
  
          &lt;ion-icon item-left name="rose" *ngIf="{{editMode}}"&gt;&lt;/ion-icon&gt;
  
          &lt;ion-icon name="{{item.icon}}" item-left&gt;&lt;/ion-icon&gt;
          {{item.title}}
          &lt;div class="item-note" item-right&gt;
            {{item.note}}
          &lt;/div&gt;
  
        &lt;/ion-item&gt;
  </code></pre>
  
  <p>And if i try with <code>*ngIf="'editMode'"</code> the result of click on button is nothing.</p>
  
  <p>When I click on a nav bar button the boolen variable is modified to true/false.</p>
  
  <p>What would be wrong?</p>