Added ability to change/save background color of any given notes.
Changed type of Event.priority to QtGui.QColor instead of string.
Haven't completely removed all references, but got rid of option to
include time in an event.

Figured out way to save dates so notes will always display the date they
were created. Everything else mostly just small stuff, like added a
couple new keyboard shortcuts and restructured context menus.

Also added a few more functions to JSONfunctions.py