Lower coverage threshold to 91.65 percent for mongoid
Optimize images

[ci skip]
Merge pull request #2072 from sferik/squish

Optimize images
Column#primary was removed at Rails4.2
Merge pull request #2073 from tsukasaoishi/for_rails42

Column#primary was removed at Rails4.2
Support Rails 4.2
Remove mongoid-grid_fs version lock
updated routes to rm deprecation warning
Merge pull request #2077 from afxjzs/master

updated routes to rm deprecation warning when running rake test
Support Japanese encodings.
Merge pull request #2078 from mtfuji/master

Support Japanese encodings.
Support for specific locale on rails_admin panel
Fixed locale for model name and fields