fixes bug when pretty-printing an invocation
Merge pull request #22 from cc18/defaultPrettyPrinterTest

fixes bug when pretty-printing an invocation
corrects the API documentation of ProcessingManager and QueueProcessingManager
Merge pull request #23 from cc18/documentationCorrection

corrects the API documentation of ProcessingManager and QueueProcessingManager
Merge remote-tracking branch 'upstream/master'