* Support Mongoid / MongoMapper embedded documents

* Add :foreign_key => ... option to update parents' votes
  - Reduce time to check relationships and foreign keys
  - More flexible
  - Need to change votable interface?

* Support https://github.com/benmyles/mongomatic &
          https://github.com/carlosparamio/mongo_odm
  - Don't have scope
  - Don't have relationships

* Add options hash validations

* Refactor specs

* More test cases for Tasks module