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)

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![Found](http://stream1.gifsoup.com/view6/2022544/hide-and-seek-o.gif)