Merge pull request #30 from fpco/master

Relax attoparsec constraint, since it has been updated
Update several comments to reflect the new auth code
Support API v3 repository deletion.  Fixes #31
Small documentation updates

* We do actually have reference docs on Hackage.
* We support HTTP Basic auth and OAuth.
Bump to 0.5.0
Allow accessing comments and milestones with authentication
Support paginated results
Always ask for 100 results per page, for efficiency
Bump version to 0.5.1
Make one function pointfree
Instead of forcing per_page, offer a PerPage "limitation"
Improve error text from a bad JSON conversion