Initial commit: Copied in from Houssam (Sam) Kawtharni's thread at Pivotal Tracker community

From:
http://community.pivotaltracker.com/pivotal/topics/release_notes_generation#reply_10350553
which links to:
https://docs.google.com/document/d/1JrU3BWMh07NYqC_UCVW-du9g2htRuo6k5ugPz4KwCwM/edit
containing the original code