Upgrade Play from 2.1.0 to 2.1.1.
Bug fix. If markers is not empty, drop events that don't have a marker in the markets set.
Add a tag field for MongoAppender that is added to keywords.
Merge pull request #18 from eujern/master

Upgraded to Play 2.1.1, fixed a bug, and added a 'tag' field for MongoAppender.