add code climate badge
use open source code climate
Merge pull request #51 from mzikherman/master

@fancyremarker => add code climate badge
Described additional options passed directly to cache.
Merge pull request #52 from dblock/readme-options

@fancyremarker => Described additional options passed directly to cache.
Update README.md

Renamed "Binding Options" to "Cache Options", since this doesn't actually apply to a binding.
Update README.md with details on required require's
Fix: Don't return valid cache keys for Model.identify(nil)
Merge pull request #61 from fancyremarker/60-dont-cache-on-identify-nil

Fix: Don't return valid cache keys for Model.identify(nil)