Merge pull request #10962 from twbs/doc-h1-thru-h6-classes

document .h1 thru .h6; fixes part of #10102
run grunt
Fixes #10959: round the .lead values down to nearest pixel via floor()
Merge branch 'master' of github.com:twbs/bootstrap
Half fix for #9855: Don't fuck with margins for open modal dialog on account of Lion non-scrollbars and inconsistencies elsewhere
Fixes #10126: Update responsive test cases to properly highlight hidden class examples
Merge branch 'master' of https://github.com/twbs/bootstrap
fix #10986
Merge branch 'master' of https://github.com/twbs/bootstrap
Updare grunt-jekyll dependency
Remove [type]

type="text/css" isn't needed
Merge pull request #10996 from ZDroid/patch-6

Updare grunt-jekyll dependency
Merge pull request #10998 from ZDroid/patch-7

Remove [type]
Merge pull request #10896 from ZDroid/patch-3

Change clone protocol from git:// to https://
there's no reason for holder.js to be executable
use CDN for html5shiv instead of vendoring it; fixes part of #10989
use CDN for jQuery instead of vendoring it; fixes part of #10989
Customizer: include config.json in bootstrap.zip

merges #10633; fixes part of #9951
Fixes #9925: convert font data to base64, fixing 0xefbfbd (Unicode Replacement Character) chars in customizer fonts.

Merges #9982
trivial refactor in build-customizer grunt task