Breaking changes for developers

If you have previously cloned the repository for development, you will need to follow the new directions in CONTRIBUTING.md

Feature

• build files into the dist folder
• use js-logger for all log statements
• add more descriptive log statements
• add granular log level support TRACE, DEBUG, INFO, etc

Fix

• fix main.css not being renamed to styles.css in dev mode
• stop updateRowsFromSource being called when sources are empty
• fix cell content being erased after preforming an operation #916

Docs

• update CONTRIBUTING.md with new build path info