Adds API key authentication and some tests for them
Small updates to ansible role to respect changes in settings
Adds support for tox testing
Small syntaxtic changes to push towards support for python 3
Removes depreicated/unused files
Moves xheaders keyword to application.listen where it is respected
Merge branch 'feature/toxtests' into develop
Merge branch 'feature/apikeys' into develop

Conflicts:
	archiver/foreman/utils.py