refs #667 - Fixed bug in logic to gray out prev. month's entries
The comparison between day and from_date would fail because the default from_date was timezone-aware while day and from_date as gathered from the form were not. I made all timezone aware. refs #503
Merge remote-tracking branch 'origin/develop' into 667-timesheet-prev-month

Conflicts:
	timepiece/forms.py
Merge pull request #673 from caktus/667-timesheet-prev-month

refs #667 - Fixed bug in logic to gray out prev. month's entries