Include license and test files in sdist

[toddrme2178]

The MIT license requires license files be included in all copies of the program. The tests are often used by downstream packagers to make sure their builds are correct.

[coveralls]

Coverage remained the same at 93.958% when pulling d8fc72f on toddrme2178:patch-1 into 138b1d9 on amol-:master.

[amol-]

I'm not particularly in favour of including non source/data files in source distributions. Especially tests they usually get detected as a package and installed in the site-packages directory, which leads to a tests module that can be imported for no good reason (and that would also override with other packages tests).

Anyone interested in tests can grab the codebase from github and run tests, I see the source distribution more as a form of packaging for install in a Python environment than as a way to actually distribute source code.