Python v2 & v3 Compatibility Update ...and more!

v0.6 has several cool things in it...

• Python v2 and v3 compatibility was refactored to only depend upon the Python-Future package ( the six package dependency has been removed).
• @Deepar3292 removed the now lifted requirement on providing either a displayName and email parameter when searching for people (you can now list all of the people in your organization, by calling the people.list() method without providing any parameters).
• Several package-level updates to make it easier for contributors to setup their environment in preparation for contributing to the package (check out the Makefile and requirements.txt updates, contributor docs are coming soon).
• Several new and/or updated bot examples running on various Python web frameworks (now includes examples for web.py, Flask, and Pyramid) - thank you @jbogarin !