remove padding form sign in form example
actually readd the padding and set it to smaller amount for narrow viewports
add some container padding for examples
Remove the handful of rem font-sizes
Merge pull request #7431 from burnsra/3.0.0-wip-fixes

Cleanup items for 3.0.0
lingering nav-list use
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip
run make after that breadcrumbs tweak
restore px unit on @font-size-base
new @component-active-bg variable
remove lingering rem