This feature adds bulk commands for process instance: activate, suspend and delete




Conflicts:
	engine-rest/src/main/java/org/camunda/bpm/engine/rest/ProcessInstanceRestService.java
	engine-rest/src/main/java/org/camunda/bpm/engine/rest/impl/ProcessInstanceRestServiceImpl.java
	engine-rest/src/test/java/org/camunda/bpm/engine/rest/helper/MockProvider.java