bump grunt-saucelabs to v5.1.1
bump patch versions of 3 grunt tasks
Sauce tests: update iOS to v7.1
add document ready jQuery wrapper in Android Browser workaround
Merge pull request #13239 from twbs/doc-load-in-example

add document ready jQuery wrapper in Android Browser workaround
Add comments in carousel.js to clarify that "slid" is not a typo

Addresses #13248.
Merge pull request #13249 from twbs/slid-is-not-a-typo

Add comments in carousel.js to clarify that "slid" is not a typo
explicitly doc that icon classes should only be used on empty elements; closes #13240
Merge pull request #13241 from twbs/address-13240

explicitly doc that icon classes should only be used on empty elements
Update "grunt-contrib-concat" dependency.
Run `grunt`.