Be smart about when we need a bleeding-edge Sphinx.
Merge pull request #1484 from mdboom/docs/graphviz-version

Set minimum sphinx based on which graphviz is present
Merge pull request #724 from eteq/default-to-wmap9

Change default cosmology to WMAP9
added todo list for v0.3 changes in coordinates
initial test and validations of array-ifyable coordinates