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Merge pull request #11334 from glebm/patch-2

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don't use nonstandard window.location.origin in customizer JS; fixes #11317
Use nesting for .placeholder()
Merge pull request #11338 from ZDroid/nestform

Use nesting for .placeholder()
Fix #7398 in Basic template

See https://github.com/twbs/bootstrap/issues/7398#issuecomment-27617890 for details.
Thanks @martinburger
Merge pull request #11336 from twbs/fix-11317

don't use nonstandard window.location.origin in customizer JS
Removed duplicated class change from migration instructions
Merge pull request #11345 from pborreli/patch-3

Removed duplicated class change from migration instructions