don't put the api version in the URIs

For the sake of restfulness, don't put the API version number in the
URL.
Instead, use the HTTP Accept token.

See http://pivotallabs.com/api-versioning/
And GitHub's API: http://developer.github.com/v3/media/
Merge pull request #8 from dmathieu/api_versioning

Don't use URIs to version the API
Adds initial changes for deployment to heroku.
Adds Heroku Rails 12factor gem to get assets working on Heroku.
Adds a default secret key base for dev and test to allow specs to pass and easier development. Still forces a secret key base to be set in production.
Merge pull request #10 from ruby-bench/heroku_config

Heroku config
Fixes mistaken rename of secret key base env var.
Merge pull request #11 from ruby-bench/fixing_secet_key_env_var

Fixes mistaken rename of secret key base env var.
Fixes typo in cURL example within the readme
Adds coveralls integration
Merge pull request #12 from ruby-bench/coveralls

Adds coveralls integration