Add start and end time to activities

[mpwoodward]

Need a start and end time added to activities

[maestrofjp]

I've gotten it working for create. Still need to work on edit.

[maestrofjp]

@mpwoodward / @kwiersma - check out:

http://localhost:8090/Enlist-Grails/activity/create

To see the new datepicker and timepicker