replaced media-xs => media-breakpoint-down(xs)
replaced media-sm => media-breakpoint-up(sm)
replaced media-sm-max => media-breakpoint-only(sm)
replaced media-md => media-breakpoint-up(md)
replaced media-md-max => media-breakpoint-only(md)
replaced media-lg => media-breakpoint-up(lg)

Breakpoints and container widths are now defined as maps.

:disabled is supported in IE9+ and all modern browsers

Mozilla fixed the bug circa Firefox 33-35:
    https://bugzilla.mozilla.org/show_bug.cgi?id=763671
Firefox 34 is the current version.
Firefox 35 should be current by the time Bootstrap v4 is released.

Fixes #14234: Reset the hack IE8-10 with another hack just for IE11 for temporal inputs and line-height

Also, makes little sense to say that Firefox sets a `-webkit`-prefixed value

Fixes #13548: Use position: absolute; to fix checkbox and radio line-height problems that were introduced after #13003

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Per:
* http://jsbin.com/purer/2/edit
* https://github.com/cvrebert/bs-css-hacks/blob/6e8aa78384a005b007fc45327c9516dcf6ec0f30/README.md#ios-temporal-input-line-height
Thanks @mdo <3

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