added validation-start time has to be before end time
fixed date-empty/time bug, removed mingroupsize field
recurring studygroups works again in the latested UI(don't use <table>)
changed info stored in unchanged SG so that times, location, and recurring are nil
Merge branch 'more_validation'
so errors don't exist
merge more_validation branch with master
fixed tests that still had fields for minsize
Merge branch 'master' into messageUi

Conflicts:
	app/views/studygroups/show.html.erb