Remove tests from distribution

[orome]

• Move test/ folder to root of project (to of crypto_enigma module).
• Don't treat tests as a project module:
  • don't list .tests as a module in `setup.py, and
  • remove __init__.py from test/ folder. (This would prevent imports)
• Ask what best way to organize tests in a package is. Should they be distributed with the package? Is there a way to run them as part of installation (maybe in a .b0 version on the test repository). How do I ensure that the code version of the package is being tested (e.g ..crypto_enigma and not some currently installed one)?

[orome]

See:

• test_suite in the setuptools documentation
• a question about how to organize tests
• the relevant py.test docs