version branching
Ports gem for 2.0 and enables admin interface
dynamic currency
Merge remote-tracking branch 'eoy/2-stable'

Conflicts:
	app/assets/javascripts/admin/spree_sale_pricing.js
	app/assets/stylesheets/admin/spree_sale_pricing.css
	app/assets/stylesheets/store/spree_sale_pricing.css
	app/models/spree/sale_price.rb
	app/models/spree/variant_decorator.rb