Make p and form tags in liveupdate updates display block.

:eyeglasses: @powerlanguage @chromakode @spladug

I removed this once before but it looks like it snuck back in with the redesign.

For many updates that are > a paragraph long we need to be able to break. This is a quasi-urgent need requested by Mike. 

With this change the opening text for the Maker's Mark thread for example will look like:

![image](https://cloud.githubusercontent.com/assets/285920/2857280/cbc5c8a6-d175-11e3-886d-26b99acca6d4.png)

Without it it looks like:

![image](https://cloud.githubusercontent.com/assets/285920/2857283/d7b1f0ea-d175-11e3-9eff-178fe1fd3e02.png)