Updates the iThenticate API package to use our own gitlab fork for ease of maintenance

add basename to DRF viewsets

deprecate unused pillow package

monkeypatch relational models to allow generics
fix #109, as it is the beginnings of adding types

add python-gitlab package to requirements
add gitlab variables to settings
add advance repos django command

add mailchimp to requirements

add python-gitlab package to requirements
add gitlab variables to settings
add advance repos django command