Ctof

* ctof now supports Kelvin to Celsius/Fahrenheit conversion
* View the readme for more details

* IMPORTANT PATCH: Moved the codebase to `__init__.py`
* ctof must now be imported as `import ctof`
* Change your code if it has been made pre-0.1.6

* Very minor patch - added project url

* Fixed a circular import error with the tests
* Tests can now be run directly, instead of running from the command line.
* The test filename has been changed: `python -m unittest -v tests/ctof-tests.py`

* NEW: Kelvin conversion
* Syntax: ctof.kel(value, temptype)
* Valid temptypes: "C", "F"
* Example: `ctof.kel(0, "C")`