Fix parameters for resources and ability to render Erlang cookie.

This adds a COOKIE parameter to the rabbitmq resource so the user can provide a
string themselves if desired. If not, a hexidecimal string will be generated
via SecureRandom.
Get rid of amqp gem, always return an array for gem dependency list
Whitespace
Baseline working (but ugly) rabbitmq_config resource
Update README
Merge pull request #4 from jakedavis/install

Make Chef converge