Specify which HTTP methods to call on each route specified by match

- Using match on its own is deprecated.
Make RSpec render_views work again by including a new config line
Remove another assignment on ActiveRecord

- This would again complain about whitelisted parameters, when I tried
  to run the rails console.
Require 'rspec/expectations' and 'rspec/mocks' in spec_helper.rb
Remove deprecated specifying of which error is being raised
Remove the deprecated config.whiny_nils in the test environment
Use the new Rails 4.0 syntax for scopes