Updated setup.py.
Updated setup.py.

Copied the contents of README into setup.py's long_description, and edited to
convert from Markdown to ReST.

josiah-wolf-oberholtzer/supriya,Pulgama/supriya,andrewyoung1991/supriya,Pulgama/supriya,andrewyoung1991/supriya,andrewyoung1991/supriya,Pulgama/supriya,Pulgama/supriya