Added native support for both 2 and 3 without 2to3 needed.
Doctests not work regardless of python version
Merge branch 'feature/2and3support' into develop
Added additional parsers
Merge branch 'develop' into feature/moreNumberTypes

Conflicts:
	natsort/natsort.py

Added doctests to the new arguments.
Improved docstring in natsort.py
Merge branch 'feature/moreNumberTypes' into develop
Fixed path sorting
Moved regex chooser to global of natsort.py to be used in __main__.py
Initial rework of __main__ to be less “path”-centric
Cleaned up some doctests in natsort.py
Added doctests and a test runner for __main__
Removed unneeded comments/functions from __main__.

Currently the doctests are now run by commenting out the regular main().
Refactored the sorting/printing function.
Completed doctests in __main__ and modified command-line-options.
Set __main__ back to non-test mode.
Merge branch 'feature/mainImprovements' into develop
Updated license years
Added py23compat.py to the manifest
Upped version and added to the change log