Get rid of empty line before the last closing bracket
Merge pull request #11690 from lipis/patch-2

Get rid of empty line before the last closing bracket
Gruntfile.js: Set line feed char to '\n' to get same result on all platforms.
add .gitattributes file to enforce Unix newlines within the repo
reference root issue in explanatory comment
account for #11050 in the docs
Merge pull request #11691 from twbs/xs-grid-docs-fix

document that XS grid supports offsets and push/pull
add comment regarding #11598
grunt