title: UI-Grid 3.1.1 cell editing boolean not responding to spacebar
body: <p>I've had the grid setup for a bit, not sure what I did, but the ability to check the box in the cell editing has stopped working but only on checkboxes.  I used Brian Hahn's method of building out select boxes and the like. I've tried this again inside a plnkr and it seems to work fine in there.</p>
  
  <p>Below are my gridOptions</p>
  
  <pre><code>rowHeight: 38,
  enableCellEditOnFocus: true,
  enableFiltering: true,
  rowEditWaitInterval: -1,
  columnDefs: [
  {
      name: 'hqLocation',
      displayName: 'HQ',
      type: 'boolean',
      minWidth: 100
  }]
  </code></pre>
  
  <p>and the HTML:</p>
  
  <pre><code>&lt;div class="col-lg-12"&gt;
      &lt;div ui-grid="gridOptions"
           class="grid"
           style="{{gridHeight()}}"
           ui-grid-pinning
           ui-grid-edit
           ui-grid-row-edit
           ui-grid-resize-columns
           ui-grid-cellNav&gt;&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>So the behavior is that it seems that it enters the cell editor, but I can't click on it (it flips between the edit and non-edit) or if I press the spacebar nothing changes.</p>