Policy history page & /history first pass

Here's a basic layout of policy history without making changes to the actual change copy.

* separates attribution from the change, places it below the change notice.
* if there have been multiple changes, it separates these into separate paragraphs, rather than merging them into a single sentence.
* changes the focus on adding and removing divisions to that act, rather than what the vote is.
* changes the terminology for 'adding' and 'removing' divisions to 'connecting' and 'disconnecting'.
* makes the display of policy votes consistent with their display on divisions **in all history pages**.

## After
![screen shot 2014-11-21 at 11 07 30 am](https://cloud.githubusercontent.com/assets/1239550/5135662/24053a8a-716f-11e4-8ae9-7e6a698e1f53.png)

## Before
![screen shot 2014-11-21 at 11 10 41 am](https://cloud.githubusercontent.com/assets/1239550/5135657/16bda024-716f-11e4-8f6d-4198acf84d5a.png)

relates to #898