add coinformation
fix for overlaping variables
add tests for coinformation
add some rv names to tests
update docstring
Merge remote-tracking branch 'autoplectic/coinformation'

Conflicts:
	dit/algorithms/__init__.py
Whitespace.
Python 3 compatibility: iteritems -> items
Tell coverage to report import errors.
Comment out scipy and matplotlib from travisCI setup.
Fix how we move into dit installation directory for travisCI.
Actually move *into* dit installation directory.
Remove itertools.izip in favor of dit.utils.zip
Add iterutils as a dependency.
Assign zip to builtin zip for Python 3.
Lots of 2.x/3.x compatibility changes.
np.prod cannot handle an iterator.
Disable travisCI tests for Python 3.3.
Re-enable Python 3.3, but install with pip.
For TravisCI, use apt-get for 2.x and pip for 3.x for NumPy.