Rails 4 support

[runephilosof]

It would be nice to support rails 4.

[jo]

I would accept a PR ;)

[charly]

I am willing to maintain the project if you wish. I would be focused on :

• rails 4
• optimisation (e.g : unnecessary find_by call when translations were eager_loaded)
• and... whatever you suggest

[jo]

@charly this is great. You now have write access to this repo. Looking forward to your contributions!

[vysogot]

Hey charly, is there any support or alternative for puret for rails 4? Thanks.