Use angular.element instead of unsafe $(...)

$ might not be defined, depending on how jQuery is loaded

Author: SHarveyPetalMD

src/calendar.js

@@ -252,9 +252,9 @@ angular.module('ui.calendar', [])
             calendar.fullCalendar('destroy');
           }
           if(attrs.calendar) {
-            calendar = uiCalendarConfig.calendars[attrs.calendar] = $(elm).html('');
+            calendar = uiCalendarConfig.calendars[attrs.calendar] = angular.element(elm).html('');
           } else {
-            calendar = $(elm).html('');
+            calendar = angular.element(elm).html('');
           }
         };