Ww3 feature/problem sets manager

Improvements to the problem sets manager including:

* Creating an "Action on Selected" pulldown similar to the classlist manager.  One can now delete sets and change multiple set properties.  
* Redoing all of the modals in ww3 to be more consistent and use the bootstrap3 modal to make the interface more consistent. 
* added whether modals are open and the selected sets to the state. 
* Included a "Show Time" checkbox to all views in ww3 with dates shown to toggle between the clock icon (for compactness) and the time in an editable input.