added simple spray layer
added swagger. Will include appmaster info using swagger-spray.
Adding AppMasterData in /appmaster service
Fix for AppMasterDataRequest
Fix for AppMasterDataRequest
Fixing issues noted in PR
Additional fixes for PR
Remove swagger-ui files under main/resources/swagger-ui and add swagger-ui as a dependency via webjars.
Correctly serialize AppMasterInfo.worker to an ActorRef.path using AppMasterInfoSerializer.
Merge pull request #37 from kkasravi/master

Initial spray layer that uses swagger
Update README.md
Merge branch 'master' into GearpumpResourceScheduler

Conflicts:
	src/main/resources/application.conf
	src/main/scala/org/apache/gearpump/cluster/AppManager.scala
	src/main/scala/org/apache/gearpump/cluster/Master.scala