GPL to MIT and other improvements

[jborean93]

Makes a few changes to the library such as

• Removed the des encryption code that was incorrectly licensed
• Rewrote a few sections to be more legible
• Rewrote the testing suite to use py.test and not unittests
• Added pep8 sanity check to the build
• Changed overall license from GPL to MIT now the code is written by myself
• Fixed up some deprecation issues with hashlib

[jborean93]

Hey @nnam, I know it is out of the blue but this PR changes the license type from GPL to MIT. You made a commit to add pass the hash support here b2e4a17 and would like to get your approval for changing the license.

[nnam]

No problem. 👍

[coveralls]

Coverage increased (+2.08%) to 100.0% when pulling 28f0996 on relicense-tidy into c729e49 on master.

[jborean93]

Thanks @nnam.