Changed default cosmology from WMAP7 to WMAP9
very minor fix in help for DEFAULT_COSMOLOGY
Updated cosmology docs for new WAMP9 default
Add citation to WMAP9 paper
DOIs for cosmology papers
Be smart about when we need a bleeding-edge Sphinx.
updated changelog for WMAP9
added todo list for v0.3 changes in coordinates
update coordinates todo list for completed arrayification