Merge branch 'release/5.0.0-rc2' into develop

* release/5.0.0-rc2:
  * Mongoid 4.0.0.rc2 support
* Mongoid 4.0.0 support
Merge branch 'release/5.0.0'

* release/5.0.0:
  * Mongoid 4.0.0 support