Add support for pausing, aborting, and promisifying appdmg execution#184

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argv-minus-one wants to merge 3 commits intoLinusU:masterfrom argv-minus-one:pause-abort-pipeline

+320-8

Commits on Jul 19, 2019

Catch pipeline errors during tests.
argv-minus-one
committed

Commits on Jul 20, 2019

Add support for pausing, aborting, and promisifying appdmg execution.
argv-minus-one
committed

Commits on Jul 26, 2019

Some fixes for pausing/aborting pipelines:
argv-minus-one
committed