Front end JS mixed with back end js in the requirement.js file

[zlmonroe]

./gui/Calculator.js is imported using node.js syntax in the backend requirements file. this file should only be used for node.js imports. front end html style imports should be included in the index.html

[zlmonroe]

Fixing this would allow the app to be used as a web app more easily later using a webpack tool (i.e. something like browserify). Thus I have labeled it as an enhancement.