Various tweaks, typos, and cleanup#9

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aaronbauman wants to merge 2 commits intoBellspringsteen:masterfrom

aaronbauman:upstream-updates

Commits on Mar 21, 2018

replaced 'models-master' with 'models' project-wide, for consistency
aaronbauman
committed
updated gitignore to exclude training data, cocoapi, and tensorflow
aaronbauman
committed