Continue work on #200 Add areas edition and rate IDs
Continue work on #200 Taxes management
Continue work on #200 Taxes management
[minor] Missing license headers
Integrate johann's work
Merge branch 'taxes' of https://github.com/jvelo/mayocat-shop into taxes

Conflicts:
	shop/cart/internal/src/main/groovy/org/mayocat/shop/cart/web/CartWebView.groovy
	shop/cart/internal/src/main/groovy/org/mayocat/shop/cart/web/object/CartItemWebObject.groovy
	shop/cart/internal/src/main/groovy/org/mayocat/shop/cart/web/object/CartWebObject.groovy