more fixes for #9513
Merge pull request #9625 from twbs/fix-9513-more

more fixes for #9513
drop legend from docs example per #9626
Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
docs.css: rm duplicate semicolon
fix spacing between examples and highlights again (my bad yo)
improve table classes' snippets and ordering
reorder and cleanup progress bar display
remove unused submenu css in docs
reorder alerts
improve pagination's active state so it looks less like the active state and more like active nav items
Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
fixes #9632: button spacing in narrow viewports
fixes #9634: turn off overflow-y when the navbar is re-expanded into horizontal mode
fixes #9622: reset to inline-block for img-thumbnail, but keep block for .thumbnail > img
improve the navbar top display in example--fixes #9635
clear up rounded corners and nuke min-height
fixes #9629
fixes #9587: add var for nav link padding
update customizer vars