Filter PubSubHubbub secrets in VCR cassettes
Re-record Curry model cassettes

We're doing this primarily so that all of the PubSubHubbub secret values
are swapped out in the cassettes. We're doing it secondarily because
GitHub has switched their API media type, and this is as good a way as
any to make sure Curry still works.
Record PullRequestAnnotator setup in a cassette
Record Curry feature spec GitHub requests with VCR
Supermarket cannot start without Dotenv loading

dotenv-rails uses `Dotenv.load` instead of `Dotenv.load!`
Use a quieter Poltergeist driver

This should eliminate the debug warnings regarding unrecognized viewport
arguments and the like
Merge pull request #282 from opscode/specs-pass-shortly-after-clone

Improve developer experience after cloning