[#68239788] Subscription Manager

* Adds haml-rails gem for deface support
* Sets spree core dependency to ~> 2.2.0
[#68239788] Subscription Manager

* Adds subscriptions relations to spree user
[#68239788] Subscriptions Manager

* Renders subscriptions for current user at user profile (users#show)
[#68239788, #70174174] Subscription Manager / Rspec Capybara

* Adds feature for subscriptions account
* Configures rspec capybara
[#68239788] Subscription Manager

* Includes spree testing support controller requests on rspec
* Uses spree_get instead of assigning routes in tests
Merge branch 'master' into feature/user-subscription-manager

Conflicts:
	spec/spec_helper.rb
	spree_random_subscriptions.gemspec
Merge pull request #2 from stevenbarragan/feature/user-subscription-manager

Feature/user subscription manager