1021662 - using HTTPProxyAuth when using proxy with authentication to populate correct field in the header
1021662 - adding a class which inherits requests.auth.AuthBase and sets up proxy and user basic authentication headers correctly instead of overwriting each other
Moving HTTPBasicWithProxyAuth class to nectar.config and adding doc blocks
adding a unit test to verify request headers when using HTTPBasicWithProxyAuth
minor update to the unit test
Merge pull request #12 from pulp/skarmark-1021662

Skarmark 1021662