Initial implementation of #34: admin widget for image Areas.
Cleaned up css/html for area widget.
Save the area every time a change is made.
This is as opposed to an explicit "save" button.
Prevented enter in area input fields from submitting form.
Tweaked add button styles.
Added docs for AreaWidget.
Merge branch 'master' into ticket/34
Added tests for the new Area update view.
Merge branch 'master' into ticket/34
Merge pull request #38 from oberlin/ticket/34

Ticket/34