Misc changes#6

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pcuenca wants to merge 3 commits intomlberkeley:masterfrom

pcuenca:misc-changes

Commits on Apr 21, 2017

* Normalize images read from the filesystem so the floats are in the [0,1] range.
pcuenca
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* `test` function defaults to using a valid image path.
pcuenca
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* Use all the generated words if no period is part of the list.
pcuenca
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