Install the `scenarios' plugin and require it in spec_helper

It is IMO a great alternative to fixtures.
See http://github.com/aiwilliams/scenarios/tree/master and further commits
for more information.

spec/spec_helper.rb

@@ -5,6 +5,7 @@ require File.expand_path(File.dirname(__FILE__) + "/../config/environment")
 require 'spec'
 require 'spec/rails'
 require 'skinny_spec'
+require 'scenarios'
 
 module LuckySneaks
   module ModelSpecHelpers