Update pypi description

Authored by Xqt on Jul 14 2017, 4:19 PM.


Update pypi description

README.rst does not contain a valid desciption fpr pypi because it also
contains root files and scripts but these files aren't shipped with the
pypi package. Use a new file "pypi_description.rst" for it.

Change-Id: I1b536ef30ce772124e0ae52472e5848b0e28867b