Updated package versions in package.json

Updated NPM packages to latest versions and also updated Gulp file to use new 4.0 syntax for task dependencies.

Fix typo in readme

Add mode setting to webpack

Update babel loader version

Update package verison.

Added notes to settings.js

Updated package versions and included example values in settings.js

Update all packages in package.json to latest tested versions.

Update to newest version of babel.

Update settings js to use new .test domain instead of .dev

Update readme.

Change domain from .dev to .test

Updated babel preset from es2015 to env.

Added error handling for CSS gulp task.