Level_up roundup for the first integration pull request

I win. :-)

I verified that the unit test still works after the commit which makes setup.py install level_up.py from `src`.

It also appears to work correctly after changing the location of the scores file, but I didn't verify that further using the unit test. If you already own a scores file in `$HOME` you may want to manually move or merge it into `work/level_up/scores`.

I've been a bit bold in updating the test Readme, please don't hesitate to reformulate if necessary.