Using ES6’s System.import allows webpack to split up the dependency
into its own chunk and load it as necessary. When this is not possible
(ie. when a script expects itself to be dropped into the html), follow
the previous strategy of copying the dependency folder into the build
folder.
Injects environment variables into the app through webpack, rather than
script snippets in index.html.
As part of this:
* Updated server.js to use node’s path package to resolve file paths
* Ensure that all url environment variables passed to the app don’t
have a trailing slash, allowing for cleaner template urls
**Note**: There are still a number of constants that should be taken
out of the app and put into environment variables.
Notable changes:
* Updated to babel 6
* Updated polyfills to only include core-js/es6 and core-js/stage/4
rather than entire babel/polyfill set
* Dev server with hot reloading replaces server.js in development
* Updated bootstrap loading to be separate from app’s stylesheets
* Cleaned up some of the font dependencies, removing the need for
templating their paths
