Subtypes

Hi there (mostly @codersquid). I'm trying to address this issue I have : https://github.com/scipy-conference/SciPy-2014/issues/107


It's so similar to a previous issue, that I just made changes as analogous as possible to the pull request that closed the previous issue (https://github.com/scipy-conference/SciPy-2014/pull/101/files)

The idea is to make the review dashboard show the submission type (Poster Only, Talk Only, Poster Or Talk). 

I have absolutely no idea what I'm doing and can't build the site to check if it works... so... review with caution?