add the total correlation
simplify, and add optional conditioning
add tests
make total correlation work on arbitrary sets of indicies
add one more test
add coinformation
fix for overlaping variables
add tests for coinformation
add some rv names to tests
add some rv names for testing
update docstring
Merge pull request #5 from Autoplectic/total_correlation

Add the Total Correlation
Merge remote-tracking branch 'autoplectic/coinformation'

Conflicts:
	dit/algorithms/__init__.py
Whitespace.