title: how to crop-area with different height/width size? with ngImgCrop
body: <p>I'm trying to crop not same height/width crop-area can I use rectangle crop-area.</p>
  
  <pre><code>&lt;div&gt;Select an image file: &lt;input type="file" id="fileInput" /&gt;&lt;/div&gt;
      &lt;div class="cropArea"&gt;
      &lt;img-crop image="myImage" result-image="myCroppedImage" area-type="square" area-min-size="20" result-image-size="150"&gt;&lt;/img-crop&gt;
       &lt;/div&gt;
  &lt;div&gt;Cropped Image:&lt;/div&gt;
  &lt;div&gt;&lt;img ng-src="{{myCroppedImage}}" /&gt;&lt;/div&gt;
  </code></pre>
  
  <p>I need set height/width like area-min-size="{100, 150}" result-image-size="{100, 150}"</p>