Add event and method params

Adds support for event and method `@param`. Looks like this: 

![screen shot 2014-07-21 at 8 26 26 pm](https://cloud.githubusercontent.com/assets/238208/3653311/2507f8f2-1150-11e4-8f1c-2d1b5b4013ba.png)

( I still need to upstream core-doc-page style and markup changes from pp.org )