AFFIXed the ToC

Had to hotpatch bs, bad but should be safe, see
https://github.com/twbs/bootstrap/pull/11199 for details (scheduled for
3.1.0)

Remaining issues:
- does not work on /docs yet,
- does not work for small window widths,
- sidebar width depends on content width, should be fixed, f(screen
width)
fix positiong problem (articles)
AFFIXed docs section
fix all remaining issues !
Add a scrollspy to highlight the current section
Oops !
fix ToC on pub pages
Scroll the ToC on the samples page
Merge pull request #292 from vicb/ToC

Fix ToC scrolls off screen on articles (close #258)