title: Controlling zoom on gmaps4rails with openlayers provider
body: <p>I am trying to control the zoom level of a map that is using openlayers as the map provider.</p>
  
  <pre><code>gmaps({
      "map_options" =&gt; { "provider" =&gt; "openlayers",
                         "auto_zoom" =&gt; false, "zoom" =&gt; 12 },
      "markers"     =&gt; { "data" =&gt; @json }
  })
  </code></pre>
  
  <p>The map (from OpenStreetMap) gets displayed but the zoom level remains the same no matter what value I use for the <code>zoom</code> option. The same code above without the <code>"provider" =&gt; "openlayers"</code> option works as expected for google maps.</p>
  
  <p>The wiki for gmaps4rails has a link to a spreadsheet which states that "Zoom" is supported (but not "auto-zoom") for OpenLayers API.</p>
  
  <p>So, is zoom control supported? Or am I doing something wrong?</p>