Release 1.2.1

Fix version number in changelog (1.2.0 instead of 1.1.3)

Release 1.2.0

Change license and updates for SS module standard.

• change license to BSD 3-Clause
• update readme and extract docs
• refactor code for testing
• add tests
• change to PSR-2
• add contributing file
• add standard code of conduct
• add standard editor config
• add standard git attributes
• add standard travis config
• add standard scrutinizer config
• add changelog