Changed the date arithmetic to get a bit more accuracy.
Changed the week number operator to '!'
Improved error checking by looking for the start and end of the command line.
Adding new parser
Reworking!
Changed to a new parser for less code and more flexibility
First cut
Reformatted code, added the __future__ import
Merge branch 'Develop'

Conflicts:
	date_calculator.py
	utils.py