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Fix classes for responsive floats in migration

See a8dc4812#commitcomment-14677726

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Add MS Edge to Sauce browser tests

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SauceLabs tests: Bump iOS to v9.1

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Travis CI: Temporarily disable caching

Add responsive float classes

Use $input-border-width for custom file input borders

Use $card-border-width for .card-inverse's header/footer border-bottom override

Fixes part of #18150

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Refs #18150

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Use $border-width in misc border print styles

Add input group example with btns on both sides for completeness+testing

Add more border width variables

Move viewport-dependent padding tweak into main .jumbotron block

Bring focused input group controls to front via z-index:3

Remove non-responsive text alignment classes

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Gruntfile: Add comments explaining CSS prefixing policy

So that the build will stop failing due to https://github.com/travis-ci/travis-ci/issues/5092

See http://bugzil.la/1228802

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