Fetch google calendar events

I want to finish tests for this but there is time limit on Assembly and tomorrow I have a lot of work and Warsaw Ruby User Group Meeting.

I would like to come back to it but also here is the work I done to this moment. Events could be fetched from google calendar, the refresh token is needed so it will have to be stored.

Only tests are missing and I have nice idea how to implement mocking of external api, would use webmock and make mini sinatra app.