dynamic "back to top" link
Added TODO file
Include Bootstrap source, compile the LESS into CSS
Updated installation and development instruction in README.md
Changed git-done version to v2.0.1
Make layout frontpage and limit line width
General facelift: fonts, frontpage title, typography
Increase base font size
Define ReactiveX color palette
Replace .content-column with Bootstrap's own col-sm-8
Minor improvement to footer
Add favicon
Fixed top margin before documentation content
Merge pull request #19 from staltz/ui-facelift

Ui facelift #18
Merge pull request #21 from ReactiveX/develop

Develop (merging PR #19)