Fixed flickering and simplified calculations

- Removed offending line causing a flicker to the default top state
- Simplified calculation of the top offset when in the bottom state
relative not absolute
Add missing blank line
Merge pull request #13081 from ZDroid/blank

Add missing blank line
Update dependencies.
Merge branch 'master' of github.com:twbs/bootstrap
Fixes #13055: Mention outdenting more
fixes #9855
build
Merge pull request #13086 from twbs/fat-fix-12983

Fat fix 12983
Break up docs into includes
Merge branch 'master' of github.com:twbs/bootstrap

Conflicts:
	dist/js/bootstrap.min.js
	docs/dist/js/bootstrap.min.js
Rename and organize nav partials for cleaner file structure
correct event naming of `scroll` and `load' event

closes #12337
Fix #12375: stop using document.body.scrollTop as it's deprecated in the strict mode

Closes #12377
Merge pull request #12862 from sultano/patch-1

Fixed flickering and simplified calculations
Fix #12845 - Modal#hide should only be called with an event argument

Closes #12850
Merge branch 'hnrch02-modal-toggle'
move sauce_browsers.yml into /grunt/; fixes #13065
Merge branch 'master' of github.com:twbs/bootstrap