- Update docs examples to use newer .form-check suite of classes
- Update form validation mixin to use newer classes as well

Fixes #20484

To be prefixed with `.table-`.

See: https://github.com/twbs/bootstrap/pull/18255#issuecomment-237034763

Fix README badge alignment.

Updated docs with extra auto resize example

Added information about the .panel-group class

v4: Split dropup button example

Update package.json to remove jspm ignore

Fix package.json

Fixes #20495

v4: Remove media margin

Remove unnecessary swearing in docs/forms.md

Remember, there may be children/students using these examples...

Remove CDN "not yet available" notice.

I updated the doc with an example of a flex layout of 3 columns where the center column is specified as a `.col-xs-5` to show that other columns will resize no matter what the width of the center column.
Experienced bootstrap developers will expect to have to use an even number for the center column width when in reality any size will work.
I believe this is quite useful information and doesn't add too much to the docs.
Another option would be to make that initial example a `.col-xs-5` instead of a `.col-xs-6` to highlight this fact in the first place.

Fix dropdown example in docs (Fix #20410)