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Tooltip/popover: Fix auto placement to use viewport

More bower.json fixes

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Per https://github.com/bower/bower.json-spec/commit/a325da3d79baab018c572d75dc1781b12322f6cd

bower.json: set `moduleType` to `globals`

Per https://github.com/bower/bower.json-spec/commit/632ff90a2c857e9cb4a4236e8ddb069cc0716865#commitcomment-10914138
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Otherwise, the test doesn't properly fail when the fix is reverted.

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Closes #16142 by merging it.

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Taken from https://github.com/ai/autoprefixer-rails/blob/master/vendor/autoprefixer.js

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Fixes #16270.

DOCS: Separation of .dropdown and .dropup.

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form-group size + form-control-feedback

Round results from gutter division to prevent decimal margins and padding

Add max-width: none to .media > .img-thumbnail

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Throw error when tooltip/popover template has multiple top-level elements

Closes #16219.

Use https on herokuapp.com

Ensure .form-inline in non-responsive example doesn't stack

Fix #16075 by switching to maintained fork of grunt-sed

Update bower.json to comply with new spec for `main`

Per https://github.com/bower/bower.json-spec/pull/43 :
> Use source files with module exports and imports over pre-built distribution files.

Also, the example in that PR doesn't include
/dist/movement.css or /dist/movement.min.css
in its `main`.

If you have a complaint about this, take it up with the Bower folks:
https://github.com/bower/bower.json-spec/issues

Per https://github.com/bower/bower.json-spec/pull/43 :
> font files [...] are not `main` files as they are not entry-points.

If you have a complaint about this, take it up with the Bower folks:
https://github.com/bower/bower.json-spec/issues

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