Content selector

[GeorgiMateev]

Implemented single item selector for generic content.

To add it to a widget

1. Create MVC widget
2. Add new designer view
   In it place this tag
3. Add .json file for loading scripts in the Views/YourWidget folder. In the file require the following scripts
   "Mvc/Scripts/Angular/angular-resource.min.js",
   "Services/services.js",
   "Services/generic-data-service.js",
   "Selectors/selectors.js",
   "Selectors/content-selector.js"
4. Add file with custom controller in Mvc/Scripts/YourWidget. In its beginning add the following lines
   var designerModule = angular.module('designer');
   angular.module('designer').requires.push('selectors');