Added Dockerfile targeting Ubuntu 20.04 where libjasper-dev isn't available#32

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espoelstra wants to merge 3 commits intoNCAR:masterfrom espoelstra:dockerbuild

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Commits on Jun 10, 2020

Added Dockerfile initially targeting Ubuntu 20.04 where libjasper-dev isn't available
Ethan Spoelstra
committed
Make Dockerfile more flexible for Ubuntu/Debian releases
Ethan Spoelstra
committed
Removing unused dependency and marking an optional one
Ethan Spoelstra
committed