Major refactoring + documentation

[icasdri]

See README (in this branch) for the overview of the whole structure, how to setup, etc.

A non-exhausitve list of changes/details

• separated backend and frontend
  • they now live in separate directories
  • basic premise is that after bundling frontend stuff, you should be able to take only the backend/ directory and run
  • Webpack is instructed to dump stats file and bundles into backend/_frontend_outputs
• setup Python virtualenv
• setup Webpack differently
  • allow mulitple entry points (aka. different bundles for apps)
  • do ES2015 transpilation
  • bundle common stuff (like React and ReactDOM, and maybe ReactRouter in the future) in a separte commons.js bundle
• created a core Django app in which we will put
  • shared templates (most app should not need to define any templates, as they are all the same since we are doing client-side rendering: just load React)
  • shared models (think auth system, users, admins, etc.)
• refactored the dummy Reimburse app to use all the new things
• exclude many things from git
• document the new structure and added setup instructions in the README

Next steps

• dummy database scaffolding system
• build out core
• build out a good example app (I'll look into migrating over student-draw)