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Merge remote-tracking branch 'origin/master'
bugfix
New feature: New utility org.copperengine.core.util.Backchannel, that offers functionality to signal a response from within a persistent workflow to its originator
Merge branch 'master' of https://github.com/copper-engine/copper-engine
fixed missing license header
#32 replaced engine.getDependencyInjector().inject(...) by engine.injectDependencies(...), because a dependency injector might be used by multiple engines
bugfix
Merge remote-tracking branch 'origin/master'
New feature: PersistentProcessorPool.suspendDequeue/resumeDequeue  Suspends/resumes dequeuing of workflow instances from the storage.