Linkify author to author search (bug 1032828)

Goes with https://github.com/mozilla/zamboni/pull/2619

Adds a link to the author that triggers an author search:
![screenshot 2014-10-01 16 04 47](https://cloud.githubusercontent.com/assets/1106/4484757/d17d29e8-49bf-11e4-8e3e-9f3a07c355e5.png)

Yeah something like that so we don't accidentally apply to something else, and makes the CSS easier to understand.