Adding profile comments search

You can now search for comments on a user's profile page.
Blessed be to @james-rodgers who made the endpoint for this.

It is behind a switch in case we have performance issues and the endpoint hadn't made it to PROD yet.

![commentssearch](https://cloud.githubusercontent.com/assets/31692/3343176/1090f4cc-f89c-11e3-877f-561bd1d19900.png)

---

![Found](http://media1.giphy.com/media/Trt8Fw4KfzVJu/giphy.gif)

Could the value of the search q parameter be ported to this element (server-side or client-side)?