update package.json for node 0.8+

It's pretty nice to have markdown in slides. It's even nicer to have
markdown in speaker notes too :)

It can be tedious to load up the speaker notes, with the whole having to
open the javascript console, and clicking on the link.

This simplifies it by automatically opening the notes in a new window.
Most browsers will warn that it's trying to open a pop-up, but it's easy
enough to allow it.

Fix Socket.IO URL

theme swap relative to theme file

typo