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
Add Bower package description
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
Update gruntfile to point to new customizer nav, run grunt
grunt
use @ssorallen's blob support test in customizer; fixes #12617
regenerate customize.min.js
Merge pull request #12773 from twbs/customizer-compat

Use @ssorallen's blob support test in customizer
more precise description of browser bug
Mozilla is trying to fix the <input> line-height bug; Yay!

See https://bugzilla.mozilla.org/show_bug.cgi?id=697451#c43
copyedit responsive-embed.html