I updated the wording of my comment above, but yes, there is no context by default.  

Firstly, this is because the `context` for a status is still in Developer Preview.  I'd not want to force it on someone unsuspecting without them being aware of it first.

Secondly, given the fact that actually sending a github status update is optional - my choice going forward would be that if we were forcing this feature on, the "default" could be overriden by the environment variable.  i.e. `context = settings["JANKY_GITHUB_STATUS_CONTEXT"] || 'ci/janky'` in `lib/janky.rb` (where I've already made a similar change)