Set motion links in righthand column

1st iteration of positioning the motion external links to the right of the motion text (OA.org + bill links). It groups the different external links under a common 'External links' heading (removing the 'related bill' copy), because the link is labeled as a bill and is clearly related or it wouldn't be there.

![screen shot 2014-10-13 at 4 43 56 pm](https://cloud.githubusercontent.com/assets/1239550/4609341/1f0532b6-529c-11e4-9d62-c48465dd2a96.png)
![screen shot 2014-10-13 at 4 44 41 pm](https://cloud.githubusercontent.com/assets/1239550/4609342/20b7c4ac-529c-11e4-82b7-785478ee118e.png)

closes #657