added colorbar api reference
added cm and collections to api reference
add axis and cbook to api reference
fix example to run with current MPL and numpy
Expanded on documentation guidelines
moved to __init__.py so Sphinx can find docstrings.
finished cleanup of docstrings so sphinx-generated API docs look nice.
more docstring cleanups. don't use PyNIO in NetCDFFile.
don't use the contents directive, it doesnt format well in pdf
installation faq updates
