Upgraded to 0.5.0 given.
	modified:   CHANGELOG.rdoc
	modified:   README.rdoc
	new file:   lib/generators/USAGE
	new file:   lib/generators/preferences_generator.rb
	new file:   lib/generators/templates/create_preferences.rb
	modified:   lib/preferences.rb
	new file:   lib/preferences/engine.rb
	modified:   lib/preferences/version.rb
	modified:   preferences.gemspec
	modified:   test/functional/preferences_test.rb
	modified:   test/unit/preference_test.rb