read readme in setup.py, for rending on pypi

It would look something like this (after the contents of the README.md have been translated to rst format):
https://testpypi.python.org/pypi/cdap-stream-client/1.0.1

Note: PyPi renders rst text, not md text. So, the readme will not be properly formatted on PyPi if it is in md format. PanDoc can be used to translate the format, but maybe it would be better to simply replace the current README.md with a README.rst, so we don't have to do this translation often.

Optionally, we can simply link to our github repo for the README, instead of having it both on PyPi and GitHub.

EDIT:
Resolution is to simply link to the README on github as Package Documentation on PyPi
https://pypi.python.org/pypi/cdap-stream-client
Looks better without the period at the end.