Looks like mongoid 3.1 doesn't actually support Rails 4
CI against mongoid 3.1
Revert "Testing that `paginate` helper properly works under mouted Engine"

This reverts commit e8cab2d34af2ab2b9133366d9dcd756d0dd02e66.

reason: this commit was accidentally added. I wanted to test that the helpers are working inside mouted engine on the fake app, but it turned out that this test is not really testing that...
Revert "count + distinct: true won't work under AR 3.0"

This reverts commit 8c736ceb2a3ba5b5584fd9f398665de32fc8745d.
reason: AR 3.0 count actually accepts distinct: true
AR 3.0: call the original count method if :distinct option was given

fixes #453
Missing CI tests
Looks like we are supporting DM and Slim
... and Grape.

[ci skip]