minor edits to docs reflecting recent changes
doc: index header looks more like README
doc: start api documentation
doc: docstrings adhere to numpydoc
add numpydoc to conf.py
improve table docstring
doc: rearrange api
header links are all internal
simplify front page
doc: add people
older versions link points up a directory
doc: add see also links
Merge pull request #449 from mrocklin/doc-refresh

Doc refresh