Add (P)SNR, RMSE, and MAE#536

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stelfrich wants to merge 4 commits intomasterfrom

Commits on Jun 5, 2018

Add (P)SNR, RMSE, and MAE implementations

stelfrich
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awalter17
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Commits on Jun 6, 2018

Rename QualityTests to QualityTest
awalter17
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Commits on Jun 8, 2018

Fix namespace methods to use interface instead of implementation
stelfrich
committed
Fix tests to use implementation instead of namespace methods
stelfrich
committed