Show log entries

Ignore the first 18 commits. When I bring spree's master up to speed with mine then these will be removed from this PR. This PR is all about the second-to-last commit. Best shown with a picture:

![screen shot 2013-11-22 at 1 16 35 pm](https://f.cloud.github.com/assets/2687/1598105/262169c0-5324-11e3-9578-13f8230dce52.png)

This allows people to view the data kept secret forever in the log entries table. This is an attempt at solving #3978 in an elegant fashion.