Update README for Play 2.2.x projects.
Update README, Play 2.1.X exclude necessary in Play 2.2.x application.
Update endpoints for changeShipmentState and changePaymentState for orders.
Merge branch 'master' into inventory

Conflicts:
	java-client/src/it/scala/IntegrationTest.scala
	java-client/src/main/java/io/sphere/internal/OrderServiceImpl.java