Basic support for BitBucket
Updating BitBalloon options, example docs
Rolling GAE version

1.9.6 is outdated.
Making access_token & site_id optional
BitBalloon docs: use `site_id` not `site`
Adding back ticks to file ref in docs
Only add `site-id` and `access-token` if present
Merge pull request #161 from factor-io/master

Add BitBalloon support