added missing entry for Fisher_Jenks_Sampled
Fixing doc strings for sphinx errors
fixing doctest for sphinx failures
cleaning up cg so doctests pass
Merge pull request #538 from sjsrey/mc

Clean up of cg and fixes of other doctests/formats
doc: pysal is now on sagemathcloud
Merge pull request #539 from sjsrey/smc

doc: pysal is now on sagemathcloud