elia/activeadmin-mongoid — pull request #51 by elia (2013-08-22 23:32:01+00:00)
Title: Add sorting, fixes #42

Taken from @bartoszkopinski ([original compare](https://github.com/bartoszkopinski/activeadmin-mongoid/compare/elia:master...master))

- no-collection case
- filtering for sorting
- conflict with simple_form