Update webhook invoice fixtures for Stripe API version 2014-01-31
Update webhook invoice event specs
Add ruby 2.1.0 to travis config
Support for multiple subscriptions
Upgrade stripe to 1.10.1
Merge branch 'subscriptions' of https://github.com/gyardley/stripe-ruby-mock into v1.10
More accurate rspec command
Canceling subscription with at_period_end preserves status
Support for customer.card events
Removed extraneous code
Moved common code to add_subscription_to_customer
Merge branch 'bugfixes' of https://github.com/gyardley/stripe-ruby-mock into v1.10
Merge branch 'card_created' of https://github.com/gyardley/stripe-ruby-mock into v1.10
Merge branch 'v1.10'

Conflicts:
	spec/shared_stripe_examples/subscription_examples.rb
Version bump to 1.10.1.0