Animation code can now be exported

Users can now export current animation code by:
  - clicking help (or pressing ?) and then clicking export
  - pressing x or e to bring up export window with code in it

Other changes:
  - refactored ToCss transform stream to use animation export
    code from utils -> getCSS
    Now both browser code and backend code can get animation css
    based on a json object (w00t)
  - Added prismjs for syntax highlighting
Version 1.0

Notes:
- Prism now highlights code properly
- Readme has decent content now (no more placeholder text)

Todo:
- Pause animation when modal open (?)
- Work a bit on performance
- Add travis ci integration