Sky theme no text-transform; larger progress bar
Add Chart.js for Markdown

Add Chart.js; also a short workaround in index.html to load
JS charts inside embedded Markdown.
Two-column CSS settings

* .two-col for two-column layout
* .span-all to span all columns (due to WebKit bug, only
  works on IE 11 when .two-col element is absolute)
* .next-col to put element to next column earlier
IE ul CSS hack for larger disc and circle list-type