Add version information to paho.mqtt.__version__

Bug: 435112
Change-Id: Ibeafbafaa864a0c53dfa0253d2e99c74f31481b2

ChangeLog.txt

@@ -2,3 +2,5 @@ v0.9.1
 ======
 
 - Fix CONNECT packet for MQTT v3.1.1.
+- Fix potential lockup when publishing from on_publish callback.
+- Add version information to paho.mqtt.__version__

setup.py

-from sys import version
+import sys
+sys.path.insert(0, 'src')
+from paho.mqtt import __version__
 
 from distutils.core import setup
 setup(name='paho-mqtt',
-	version='0.9.1',
+	version=__version__,
 	description='MQTT version 3.1/3.1.1 client class',
 	author='Roger Light',
 	author_email='roger@atchoo.org',

src/paho/mqtt/__init__.py

+__version__ = "0.9.1"