Add split gem dependency and update recommender to receive
strategy from strategy generator.

Strategy generator uses split ab test method to generate a
strategy.
Implement split gem for a/b testing of strategies.
  * Add ab test method to Places controller create action.
  * Add finished method to recommendation controller update action.
  * Add split gui
  * Add seed data
  * Update tests
Integrate ab testing into master branch.
  * Add finished method to track conversion of
  recommendation strategy experiment.
Merge pull request #41 from banana-slugs-2014/ab_testing

Ab testing
Merge branch 'master' of https://github.com/banana-slugs-2014/help.me into facebook-strategy

Conflicts:
	app/controllers/places_controller.rb
	spec/controllers/places_controller_spec.rb