Added support for inverted and normal scans at the same time#326

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alpbak wants to merge 3 commits intojourneyapps:masterfrom

Commits on Sep 14, 2017

Added a mixed scan mode to enable scanning inverted and normal barcodes
alpbak
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Commits on Sep 15, 2017

Added a mixed scan mode to enable scanning inverted and normal barcodes
alpbak
committed
Revert "Added a mixed scan mode to enable scanning inverted and normal barcodes"
alpbak
committed