Now Supporting Python v2/v3!

The package now supports Python v2 and v3! Please upgrade to this release to test the package with your v2 or v3 code, and report any issues via the issues page.

Upgrade also includes:

• Example / sample scripts (thank you @brbester !).
• Default / native support for retrieving your Spark access token from the SPARK_ACCESS_TOKEN environment variable (thank you @ObjectIsAdvantag !).