Bootstrap 2.1.0

After a smaller 2.0.4 release, we've got another huge update that resolves tons of bugs, improves the flexibility and durability of our code, and introduces a few awesome new features. It's a big release wrapped in a brand new set of docs and we couldn't be more stoked to launch it.

New docs, affix plugin, submenus on dropdowns, block buttons, image styles, fluid grid offsets, new navbar, increased font-size and line-height, 120+ closed bugs, and more.