Added mongodb store.
Added mongodb service to travis.
Finalized the code and improved type conversion.
Merge remote-tracking branch 'upstream/develop' into feature/storehaus-mongodb
Limited the types you can use with MongoStore
Forgot to delete one line.
Changed some internal calls. Added Java date.
Changed back casbah version.
Merge pull request #199 from lanxx019/feature/storehaus-mongodb

Issue #72: Added mongodb store.