Remove reliance on distribute

Assume setuptools is present and do not try to install
distribute.

Fixes issue #19

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
add docs to default tox suite

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
prep for 0.9 release

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>