Add a Bitdeli badge to README

Author: bitdeli-chef

README.md

@@ -237,3 +237,7 @@ angular.module('myApp').controller("myCtrl",function($scope){
   ga('send', 'pageview');
 
 </script>
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+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/angular-libs/ui-grid/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
+