Removing unused Badge#image field
Mongoid tests corrections
Fix mongoid support adjustments
Rails 4 tests fix
This reverts commit c7fe19780b4049010d4d8a80cb4b59240fcf34fd.

When
https://github.com/tute/merit/pull/146/files#diff-b36af4be06e39d478b3d39d216a368faR73
runs configuring eager_load_paths, Merit.orm is always the default
:active_record. If we move that line to a later initializer, array is
frozen and can't be modified (adding Mongoid models for instance).

Conflicts:
    lib/merit.rb
    test/test_helper.rb
Fix RelatedChange issue (145)
Merge pull request #148 from Arugin/mongoid

Mongoid support and tests corrections
ActiveRecord and Mongoid enabled.

[skip ci]