Update to Bootstrap 3.3.1
Add HTML5 shims for IE8 with Bootstrap 3
Make shims run only in IE8

Ideally, the shims would be added via a conditional HTML comment so that they
only would be loaded in IE8. Pandoc doesn't seem to support inlining JS code
in conditional comments, so instead I've modified the JS code to only run in
IE 8.
Update HTML dependency for Bootstrap 3
Update Bootstrap themes to Bootstrap 3
Store fonts for themes locally
Use monospace font for compatiblity with qt
Respect markdown table alignment within bootstrap themes
Merge pull request #314 from wch/feature/bootstrap3

Update to Bootstrap 3.3.1