Merge pull request #13493 from twbs/close-btn-access

Improve accessibility of close buttons in modals & alerts
include RTL CSS CDN URL in Download docs
add RTL CSS files to "What's included" section of docs
emphasize that bootstrap-rtl.css & bootstrap.css should not be used together
replace js scrollspy test for default behavior
Fix .visible-print deprecation version #.
import rules from Ratchet's JSCS config with which we already comply
Merge pull request #13506 from twbs/jscs-ratchet

import rules from Ratchet's JSCS config with which we already comply
Allow for resetText of a button to be a falsey value; fixes #13466
temporarily lock grunt-jscs-checker to v0.4.0

Per #13512 & https://github.com/mdevils/node-jscs/issues/357
update-shrinkwrap
bump grunt-jscs-checker to v0.4.1; refs #13512
Merge pull request #13514 from twbs/jscs

bump grunt-jscs-checker to v0.4.1
Merge pull request #13406 from EnsignR/closed.bs.alert-after-remove

fires closed.bs.alert *after* DOM detach() as per #12379
Merge pull request #13511 from hnrch02/button-reset-falsey-values-fix

Allow for resetText of a button to be a falsey value; fixes #13466
Update JSZip to v2.2.2.
tweak formatting in Carousel docs for clarity; fixes #13522
unlock & bump grunt-jscs-checker to ~0.4.3
Merge pull request #13528 from twbs/unlock-jscs

unlock & bump grunt-jscs-checker to ~0.4.3
Merge pull request #13504 from Quy/resputil

Fix .visible-print deprecation version #.