Python 2.7.12 and 3.5.2 Support

Change effective on 28 June 2016

Heroku now supports Python 2.7.12 and 3.5.2. You can specify a version with a runtime.txt file.

Python 2.7.12 is now default for all new Python applications. Existing applications will not be automatically updated.

Build tools were also updated: setuptools to v8.1.2, pip to v23.1.0.