fix: remove should use an angular promise

Author: ocombe

src/angular-localForage.js

@@ -108,13 +108,21 @@
 
 // Remove an item from storage
 var removeItem = function(key) {
-var promise = localforage.removeItem(prefix() + key);
+var deferred = $q.defer(),
+args = arguments;
+
+localforage.removeItem(prefix() + key).then(function success() {
+deferred.resolve();
+}, function error(data) {
+onError(data, args, removeItem, deferred);
+});
+
 if(notify.removeItem) {
-return promise.then(function(value) {
+return deferred.promise.then(function(value) {
 $rootScope.$broadcast('LocalForageModule.removeItem', {key: key, driver: localforage.driver()});
 });
 } else {
-return promise;
+return deferred.promise;
 }
 };