Move code to src/ and tests to test/
Add .gitignore

Done to ignore __pycache__ folders
Refactor outfox

The script to download from mangafox.me was completely refactored into mangafox.py
This was to make it easier to understand and also easier to test
Add unit tests for mangafox.py

test-mangafox.py unittests mangafox.py
Most features are tested. However it only works if it is in the same directory as mangafox.py