title: TypeError: swal is not a function in SweetAlert.js in angularjs using ngSweetAlert
body: <p>I have tried the ngSweetAlert in my angular app. and when ever itry to used the SweetAlert.swal() Error occured im my developers tool TypeError: swal is not a function.</p>
  
  <p>snippet.</p>
  
  <pre><code>(function() {
  'use strict';
  var app = angular.module('iCheckMobile', ['oitozero.ngSweetAlert']);
  var BASE_URL = 'http://localhost:8000/';
  
  app.controller('MobileCntrlr', ['$http', '$scope', '$window', '$location', '$interval', '$timeout', 'iCheckMobileFactory', '$filter', 'SweetAlerts', function($http, $scope, $window, $location, $interval, $timeout, iCheckMobileFactory, $filter, SweetAlerts) {
      var mbleCntrl = this;
  </code></pre>
  
  <p>.
  .
  .
  ///area where i used ngSweetAlert</p>
  
  <pre><code>var forceSubmitExam = function() {
          // $window.confirm('Submiting exammination automatically');
          SweetAlerts.swal('Submitting Examination Automatically', 'You have not enough time', 'success');
          var submitInfo = {
              'answers': JSON.stringify(mbleCntrl.answers),
              'student_id': mbleCntrl.studentDetail.id,
              'subject_slug': mbleCntrl.subject_slug,
              'subject_id': subject_id
          };
          $http.post(BASE_URL + 'mobile/examination/submit', submitInfo)
              .success(function(response) {
                  mbleCntrl.answers = '';
                  console.log(response);
              })
              .error(function() {
                  $window.confirm('Error on submitting the examination!');
              })
      };
  </code></pre>
  
  <p>SweetAlert.js</p>
  
  <pre><code>    angular.module('oitozero.ngSweetAlert', [])
  .factory('SweetAlerts', [ '$rootScope', function ( $rootScope ) {
      var swal = window.swal;
      //public methods
      var self = {
          swal: function ( arg1, arg2, arg3 ) {
              $rootScope.$evalAsync(function(){
                  if( typeof(arg2) === 'function' ) {
                      swal( arg1, function(isConfirm){
                          $rootScope.$evalAsync( function(){
                              arg2(isConfirm);
                          });
                      }, arg3 );
                  } else {
                      swal( arg1, arg2, arg3 );
                  }
              });
          },
          success: function(title, message) {
              $rootScope.$evalAsync(function(){
                  swal( title, message, 'success' );
              });
          },
          error: function(title, message) {
              $rootScope.$evalAsync(function(){
                  swal( title, message, 'error' );
              });
          },
          warning: function(title, message) {
              $rootScope.$evalAsync(function(){
                  swal( title, message, 'warning' );
              });
          },
          info: function(title, message) {    
              $rootScope.$evalAsync(function(){
                  swal( title, message, 'info' );
              });
          }
      };
  
      return self;
  }]);
  </code></pre>
  
  <p>I think there is something wrong with it, can you help me guys, ^^ totally novice in angular. thanks.</p>