Changes user page to show 'recent contributions' rather than 'policies create by'

**This requires a fix before it can be merged.** The records don't sort properly, it's a problem with my query in the user controller, I think related to the difference between wikimotion and papertrail records.

Otherwise, this simply swaps the copy and list of policies created by the user for a title and list of contributions. Basic first pass.

closes #968 

## After
![screen shot 2014-11-28 at 7 31 10 am](https://cloud.githubusercontent.com/assets/1239550/5221601/e4dacfbe-76d2-11e4-922a-3055a782f422.png)

## Before
![screen shot 2014-11-28 at 7 48 54 am](https://cloud.githubusercontent.com/assets/1239550/5221609/0c1a72a0-76d3-11e4-96f8-7607ab5740b3.png)