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'