Support for 'extends' tag

• Added support for 'extends' tag

Renamed to gitlab-local-pipeline

• Repository name have changed, and executables are now called gitlab-local-pipeline

Added "some" default support

• Added support for default:before_script
• Added support for default:after_script

Added include:local

• Added support for Include:local tag

Added support for various yml keys

• Added after_script support
• Added allow_failure support

Initial version

• Supports stages, before_script, script and variables