Tests for these scripts also removed from /tests and from .travis.yml
Two .zip archives accidentally deleted from /tests/src_invalid, re-added them
and changed .gitignore to prevent the problem
- The tests now automatically run depending on whether you have the dependencies
installed, instead of failing and throwing exceptions.
- CONTRIBUTING.md has more information on how to run the tests.
- When the tests run, they will save their logs to /test_logs instead
of printing them so you can read them later.
- Change names of source file directories to make them more descriptive