Export Stripe subscription integration to the engine
Update dependencies
Add worker for handling Stripe events

 * cover webhooks with tests
 * add resque dependency
Setup CI with Travis
Fix compatibility with latest version of Stripe API
Merge branch 'master' of github.com:techery/stripeon into get_rid_of_devise

Conflicts:
	Gemfile
	Gemfile.lock
	app/controllers/stripeon/base_controller.rb
	app/controllers/stripeon/billing_settings_controller.rb
	app/controllers/stripeon/credit_cards_controller.rb
	app/controllers/stripeon/home_controller.rb
	app/controllers/stripeon/payments_controller.rb
	app/controllers/stripeon/subscription_cancelations_controller.rb
	app/controllers/stripeon/subscription_upgrades_controller.rb
	app/controllers/stripeon/subscriptions_controller.rb
	app/controllers/stripeon/webhooks/stripe_events_controller.rb
	app/models/stripeon/credit_card.rb
	app/models/stripeon/subscription.rb
	lib/stripeon.rb
	spec/dummy/app/models/user.rb
	spec/dummy/app/views/layouts/application.html.erb
	spec/dummy/app/views/layouts/application/_current_subscription.html.slim
	spec/dummy/app/views/layouts/application/_subheader.html.slim
	spec/dummy/config/routes.rb
	spec/dummy/db/migrate/20140721183108_create_users.rb
	spec/dummy/db/schema.rb
	spec/factories/users.rb
	spec/features/stripeon/billing_history_spec.rb
	spec/features/stripeon/billing_settings_spec.rb
	spec/features/stripeon/cancel_subscription_spec.rb
	spec/features/stripeon/download_pdf_receipt_spec.rb
	spec/features/stripeon/pay_for_order_spec.rb
	spec/features/stripeon/preview_order_spec.rb
	spec/features/stripeon/see_plans_table_on_billing_settings_page_spec.rb
	spec/features/stripeon/update_billing_info_spec.rb
	spec/features/stripeon/upgrade_to_higher_plan_spec.rb
	spec/features/stripeon/view_current_subscription_details_spec.rb
	spec/features/stripeon/view_list_of_active_plans_spec.rb
	spec/rails_helper.rb
	stripeon.gemspec
Remove devise initializer.