This is supposed to be a reminder for me to remove test_main.py after all the related PRs have been merged. I gradually converted the unittest.TestCase tests to separate modules so any code that is left over should be deleted.

1. Hackebrot convert test cookiecutter local no input #332 TestCookiecutterLocalNoInput
2. Hackebrot convert test cookiecutter local with input #334 TestCookiecutterLocalWithInput
3. Hackebrot test arg parsing #336 TestArgParsing
4. Convert test abbreviation expansion to py.test #337 TestAbbreviationExpansion
5. Convert test cookiecutter repo arg to pytest #338 TestCookiecutterRepoArg