Install rspec, and generate binstubs for convenience.
Convert existing HomeControllerTest to RSpec.
Create a placeholder User spec.
Install factory_girl_rails and random_data to replace fixtures.
Convert the User fixture to a Factory.
Create a rudimentary test for the required attributes of the (currently) barebones User model.
Create some empty helper specs for existing helper classes.
Remove redundant tests I won't use anymore.

 * Add .keep files for spec folders I'm not using yet, but will soon.
Remove :test Rake tasks, because I'm using RSpec now.
Merge branch 'rspec'
Install MailCatcher so we can use ActionMailer without an actual mail server.
Add mailcatcher settings to Rails development environment settings.