Unit tests failing with new tifffile version 0.12.0

[kmdouglass]

The Travis script is pulling tifffile from pip, which now is at 0.12.0. However, Anaconda's meta.yaml file installs tifffile 0.10.0 from https://anaconda.org/kmdouglass/tifffile.

The Travis script should be updated to always use tifffile 0.10.0 from the above link.

Output from Travis: https://travis-ci.org/kmdouglass/bstore/builds/223431909

[kmdouglass]

.travis.yml is now using tifffile from the kmdouglass Anaconda channel and unit tests are passing.