Get rid of mocha
Remove shoulda
Enable the home page to render a response when no event is set up.
This involves moving the category creation/update from the db/seeds.rb
to an initializer.  This ensures the app has the data it needs to run
even if the admin forgets to `rake db:seed`
Merge pull request #27 from jcoyne/no_mocha

Get rid of mocha
Merge pull request #28 from jcoyne/homepage_without_event

Enable the home page to render a response when no event is set up.
Added test for sessions controller
Add test for PresentationsController