Add more tests for user fields
Add Netrc auth method

Adds ability to authenticate with Netrc, either with a path or default `~/.netrc`.
Merge pull request #41 from catsby/add_net_rc

Add Netrc auth method
Create relative hyperlinks.

This will preserve the urls for GitHub Enterprise.
Merge pull request #43 from calavera/relative_hyperlinks

Create relative hyperlinks.