Searches working in ActiveAdmin now.
Remove logging messages.
Sidebar filters are enabled.
Code cleanup before pull request.
add fix to allow search criteria based on hashes fields - needs to be improved
Updated dependencies to mongoid 3.0 or above.
Merge pull request #1 from simplybusiness/filter_support

Updated dependencies to mongoid 3.0 or above.
Merge changes from upstream
Merge branch 'master' into filter_support
Merge branch 'master' of github.com:simplybusiness/activeadmin-mongoid
Merge branch 'master' into filter_support
Update gemspec to test if works with mongoid 2.4
Added proper support for associations and probably for mongoid 2.4
Added support for numeric fields
Change big elsif to case
Marge regular expressions into one for is_query
Added support for time
Merge branch 'master' into filter_support
Display string search field for Object types.
Hack to improve performance with mongoid 2.4

There was a problem with mongo driver used in mongoid 2.4. I
incorporated something like pagination in search, to limit number of
documents queried.