extract scheduler implementation and abstract resource respresentation
refactor resource related code
temporary commit
refactor code
continue refactor code
refactor
minor fix
add explicit message of worked added and terminated
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
minor fix
rename the file
remove useless code
Merge pull request #48 from huafengw/GearpumpResourceScheduler

Gearpump resource scheduler