add a ShannonPartition object
boom! way more efficient
add tests, and __getitem__
some tweaks, better coverage
fix docstring
Merge branch 'master' into idiagram
Add requirements.txt for dit.
Update install_requires to include prettytable.
Merge pull request #1 from chebee7i/idiagram

Fix dependencies.
add networkx to reqs
don't use set literals for not-so-new pythons
more set literals
fix for string formatting changes
oops, no iteritems() on py3
Merge pull request #27 from Autoplectic/idiagram

Create an I-Diagram method