Link to prof pages from course pages

Makes the existing prof's names on the courses page clickable and links to their page. 

Fixes #188 

![prof_link_from_courses](https://cloud.githubusercontent.com/assets/2644780/3565711/770b61ce-0acb-11e4-9221-f8446670495d.png)

nit: I think it makes slightly more semantic sense to have the `h3` as the outer tag and the `a` as the inner tag. Also, pre-HTML5 the `a` tag is a inline element and you can't that inside of the `h3` element which is a block-level element.

See http://stackoverflow.com/questions/8174497/anchors-inside-headers-or-visa-versa for a more detailed discussion.