title: Store filter greater than or equal
body: <p>I have a store containing scores.I need to filter out than score >10 and less than 3.
  Is it possible to filter out data.
  I tried:</p>
  
  <pre><code>    Ext.getStore('MyStore').clearFilter(true);
      var RStore = Ext.getStore('MyStore');
      RStore.filter('score', '2');
  </code></pre>
  
  <p>this is working.but it filters fields having score 2.
  I need to the store data having score >10....</p>
  
  <p>I saw a stack link it is not possible</p>
  
  <p><a href="https://stackoverflow.com/questions/12216588/extjs-4-remote-filter-store-smaller-bigger-than">Extjs 4 remote filter store smaller (&lt;) bigger (&gt;) than</a> </p>
  
  <p>Pls help me to have this.</p>