Adding contribution guidelines
Fixing typo
First pass at replacing URLLib2 with Requests in Read API
WIP test refactoring
WIP test refactoring
Refactor attachment upload to use Requests
Remove urllib2 and poster libs, fix some HTTP error handling
Remove poster from setup, and fix keyword whitespace
We're still sending JSON in a lot of cases
More JSON-sending fixes
Rewriting some failing tests
Fixing all the tests