toolchain: use webpack instead of jspm

[andrenarchy]

Changes:

• use webpack for bundling everything
  • typescript -> babel -> es5 (minified for production build with --optimize-minimize)
  • less -> css (also minified for production)
  • minify html
  • minify images
  • copy static assets (mathjax, pdfjs worker, favicon)
• install all dependencies via npm
• remove jspm, bower, gulp,
• move html/ files in app/ and properly require() them
• install @type definitions for all used modules
• create type definitions for
  • pdfjs (move upstream!)
  • dentist
  • kramed
• fix all typescript errors
• introduce proper typescript linting with tslint

[jengeb]

• map on about page doesn't appear
• modal (e.g., feedback): the X to close the modal is focussed
• widget: no text

[andrenarchy]

I fixed the map and the widget. The modal issue will be solved with ui-bootstrap@2.3.1 according to angular-ui/bootstrap#6295.

Good to go in my opinion! 😄