Merge #6 and bump version up to 0.5.0

Author: tdicola

setup.py

@@ -3,7 +3,7 @@
 from setuptools import setup, find_packages
 
 setup(name              = 'Adafruit_GPIO',
-      version           = '0.4.0',
+      version           = '0.5.0',
       author            = 'Tony DiCola',
       author_email      = 'tdicola@adafruit.com',
       description       = 'Library to provide a cross-platform GPIO interface on the Raspberry Pi and Beaglebone Black using the RPi.GPIO and Adafruit_BBIO libraries.',