Merge branch 'release/5.0.0.alpha5' into develop

* release/5.0.0.alpha5:
  * Support for mongoid 4.0.0.alpha2 * Fixed readme
Merge branch 'release/5.0.0.beta1' into develop

* release/5.0.0.beta1:
  * Mongoid 4.0.0.beta1 support
fixed conflicts
* Mongoid 4.0.0.rc1 support
* Removed debugger
fixed conflicts