Use Solr to search for users


![screen shot 2014-12-29 at 2 22 13 pm](https://cloud.githubusercontent.com/assets/8673900/5571985/1ecd2c2a-8f66-11e4-99da-c0fa1295efc5.png)
* A User can search for users through username, elo, first and last name
* Search is in the header

* need help on styling
I'm not sure. But I think the development gem would code it differently. I'll check to see if it works on heroku tomorrow!