Change border to border-radius

Border isn't set, but border-radius is.
use https:// for CDN links

- works when viewing page via file://
- sets a good example security-wise
Merge pull request #11018 from twbs/use-https

use https:// for CDN links
documentation that multiple modals are not supported
Merge pull request #11049 from alexdahl/multiple-modals-doc

documentation that multiple modals are not supported
Add more functionality to .small
Merge pull request #10933 from ZDroid/patch-2

Change border to border-radius
Merge pull request #11059 from ZDroid/patch-5

Add more functionality to .small to match <small>
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