Need to use extra care on skimage.io.plugin('freeimage'...)
Merge branch 'issue253' into devel
Must skip warning tests if version of six is < 1.7.
Merge branch 'issue255' into devel
Finesses the check of skimage.io

If on Anaconda and python3 and the scikit image version < 0.11, then
don't bother.  Otherwise, go back to prior try/except code for existance
of skimage.io and availability of freeimage backend, which fixes the
issue on Linux Mint.
Merge branch 'issue256' into devel
Rewrote jp2dump as an entry point console script.

Some printing UT refactoring was done.
Merge branch 'issue254' into devel
Restored set_parseoptions, get_parseoptions to glymur/__init__

Was mistakenly removed.
Add six to travis harness requirements.
Merge branch 'issue259' into devel
Merge branch 'devel' of https://github.com/quintusdias/glymur into issue246
Merge branch 'issue246' of https://github.com/quintusdias/glymur into issue246
More progress.  All UTs passing on Mac/3.4.1/2.1.0

__getitem__  method needs a refactor.  Need to test on JPX file with
multiple images.