MikeAndrianov/easy_learning — pull request #20 by pavlik4k (2014-03-18 17:11:03+00:00)
Title: Add groups and courses

I think associations should look like this
![associations](https://f.cloud.github.com/assets/4967742/2448547/90ba0d44-aea7-11e3-965a-a56ae73ab39c.jpg)