Successfully handle 404 from Repository.issue()
test_iter_keys
test_iter_labels
Fix pubsubhubbub.

It shouldn't be using JSON but a form instead.
More pubsubhubbub changes
Add comment about the behavior
Add test for GitHub.pubsubhubbub
Language test fixture
test_iter_languages
test_iter_milestones (70% coverage)
HISTORY and version changes for 0.4
Merge remote-tracking branch 'github/pr/49' into develop
test_iter_network_events and fix Repository.issue
Add notification fixture
test_iter_notifications
Add requires_auth to iter_notifications.

Add a safety check for the user in iter_pulls.
test_iter_pulls
test_iter_refs
test_iter_stargazers
test_iter_subscribers