Fix installation with requirements

* Fix installation from remote github repository via pip
   now we can install it using:
   pip install git+<github url>

Change-Id: Ibff661de9d4773f3c2d372e18a0e11c0cd7be40e

setup.cfg

@@ -2,7 +2,7 @@
 name = python-mistralclient
 version = 0.01
 summary = Mistral Client Library
-description-file = README.rd
+description-file = README.md
 #license = Apache Software License
 classifiers =
     Programming Language :: Python

setup.py

@@ -19,4 +19,5 @@
 import setuptools
 
 setuptools.setup(
-    name="python-mistralclient")
+    setup_requires=['pbr'],
+    pbr=True)