Shows past talks

**Don't merge this yet.** I'm having issues with running the tests-- I suspect bc of the version problem I brought up yesterday.  I'm not familiar with mini-test and wasn't sure if I should try writing tests in rspec.

In any case, would love some feedback resolving the version issues.  I was getting the following error when I tried to run the tests and server, though it was working before so not sure at what point it broke: 

.rvm/gems/ruby-2.1.1/gems/rake-0.9.6/lib/rake/ext/module.rb:36:in `const_missing': uninitialized constant Haml::Util::Sass (NameError)