[Code Review Fix] Add listbox to exhibits form.
1. Async download listItem template for contentItems.
2. Renamed container2 to listItemContainer.
3. Pass listItemContainer as a parameter to exhibitForm.
[Code Review Fix] Removed obsolete code from authoring files. Fixed bug #313.fixed bug with fallbackpage.

Details:
1. Fixes for code review http://mrccodereview.cloudapp.net/ui#file:review=1147;
2. fixed bug #313. Fallback: Fallbackpage rendering is broken.