code: function(){
  			var d = new Deferred();
  			this._preferenceService.get(this._prefix, undefined, {scope: 2}).then(
  				function(pref){
  					var result = [];
  					var repositories = Object.keys(pref);
  					
  					for(var i=0; i<repositories.length; ++i){
  						if(repositories[i] !== "settings"){
  							result.push(repositories[i]);
  						}
  					}
  					
  					d.resolve(result);
  				}
  			);
  			
  			return d;
  		}
docs: Returns all repository URLs, which have stored
  credentials in the storage.