Fixed hardcoded tooltip arrow positioning

Tooltip Arrow positioning was hardcoded to 5px instead of using @tooltip-arrow-width.
Fixes #10492: Account for responsive tables in panels
Merge branch 'master' of github.com:twbs/bootstrap
Merge pull request #10573 from gribelu/tooltip-fix

Hardcoded Tooltip arrow positioning
@grid-float-breakpoint need to be @screen-sm-min

:smile:
Merge pull request #10597 from ZDroid/patch-1

@grid-float-breakpoint need to be @screen-sm-min
Added in list elements for dividers
Merge pull request #10602 from mikefrancis/patch-2

Added in list elements for dividers
rm irrelevant entries from .gitignore; fixes #10609
Merge branch 'master' of https://github.com/twbs/bootstrap into develop