Fix Organizer#with spec
Adding MIT licensing
Pass user instead of context to Organizer#with
Merge branch 'fix-wrong-spec' of https://github.com/padi/light-service

* 'fix-wrong-spec' of https://github.com/padi/light-service:
  Pass user instead of context to Organizer#with
  Fix Organizer#with spec
Adding RailsConf 2013 blog post with video
Updating RailsConf 2013 link in README
Using a slight reference from @dhh