feat(controller) add dispatcher
Merge pull request #26 from xiangli-cmu/master

feat(controller) add dispatcher
feat(controller) add dispatch AddInstanceEvent
Merge pull request #27 from xiangli-cmu/master

feat(controller) add dispatch AddInstanceEvent
feat(controller) addListener
Merge pull request #28 from xiangli-cmu/master

feat(controller) addListener
finish controller RPC
Merge branch 'master' of github.com:go-distributed/raccoon into dev

Conflicts:
	controller/controller.go