Create Promotion component
Rename PromotionsBundle into PromotionBundle
Creating Taxation component
Fixing references to TaxationBundle classes
composer.json, CHANGELOG, LICENCE and README for Taxation component
Merge pull request #1232 from jjanvier/component/taxation

[Component] Taxation
Creating Shipping component
Fixing references to ShippingBundle classes
composer.json, CHANGELOG, LICENCE and README for Shipping component

Fixing FQCN
Merge pull request #1237 from jjanvier/component/shipping

[Component] Shipping
Merge pull request #1230 from stloyd/feature/promotion-component

[Component] Promotion
Creating Payment component
Rename PaymentsBundle into PaymentBundle