Change file paths to be package relative

The file paths were previously linked to the laptop on which the script was developed rather than relative to the package itself. This change will allow it to work on any computer with Python3 and the package installed. Tested on OS X
Merge branch 'compatibility' of https://github.com/johnsaigle/production-scheduler into compatibility
Merge compatibility branch with master

Files are loaded in a package relative structure rather than being
hardcoded. Script functions on windows and os x systems