Interim 14

@scottkellum @Snugug, This branch is an interim proposal for 2014 site. Please review. Additionally, there are some open todos. 

I copied over the ``Gemfile`` from the ``2014`` branch because I was having issues building the repo from a direct clone of master. I also added a `.rbenv-versions`` file. Strangely, Middleman didn't list compatible versions with ``1.9.2`` even though the ``.rvm`` file specficies it. Not entirely satisfied with site structure/config, but it works. 

### Summary of Changes

* Promote speaker application
* Add more call to actions for proposals; updated date to May 30th
* Add submissions info
* Add refund policy. Will add to Ticketbud once site is live
* Add link to financial aid application
* Add reviews
* Use yaml files for data
  * I have some thoughts around how we architect our sites to better handle new years and expansion to discuss
* Cleaned up sponsor section
* Navigation
* Stub ``/schedule`` page. Archive 2013 at ``/schedule/2013``

### Todos

- [ ] Review block float + grid alignment issues: Responsive is wonky. Hack to get column widths to align is a hack.
- [ ] Add link to ohours (CS)
- [ ] Keynote block width overflows container at small screen sizes
- [ ] Review copy; is submit a session good choice of nav? scrutinize everything