get_changed_studies method added
one more test to verify the behavior on bogus SHAs
Just logging a message of cache failure

No longer logging the exception. This failure is expected
if you are not running redis to cache.
some tests commented out
reinstating full set of tests
Merge branch 'master' into issue-11
using correct repo name for phylesystem-api
example of using phylesystem to count the number or trees
README updated
better error exit message
Oops. this time it really is a better error exit message
Merge pull request #41 from OpenTreeOfLife/issue-38

Issue 38 'report study IDs that have changed between 2 branches/commits' ... and command line nexson conversion, etc.
Merge tests
Merge commit - #11
Merge pull request #56 from OpenTreeOfLife/pip-installable

Pip installable
Merge pull request #57 from OpenTreeOfLife/merge-fix

bug fix in code for merging OTU groups
conflict resolution