Beginning work on actually displaying pull requests

Add Octokit and OctokitHelper for RSpec
Mocking Octokit.pull_requests to not have to actually issue reqeusts to
github. This will be used in request specs and anywhere else it may be
necessary.

Currently only checking for existence of *all* pull requests on page.
Replace ERB with HAML ftw.
Basic functionality for showing pulls with Octokit

Needless to say, this will throw auth errors
PRs now being pulled for a specific repo

Also, adding some filters to the mock
Fixes for specs broken due to new functionality
Fix to Guardfile - remove dupe

Also update devise and arel
All pull requests for GA org repo