With the current docs directory setup, I'm making too many mistakes and have to manually address path changes and directory moves on deploy. This makes for a frustrating experience developing locally and shipping releases. With this PR, we're basically back to the same setup from v3—duplicating the dist directory into our docs directory. Not the most ideal, but very straightforward for me as the release manager.

This reduces duplication and the chances to forget to update something.

Kept back karma-qunit and qunitjs because tests fail.

Having it uppercase doesn't offer anything and the lowercase version slightly improves gzip compression.

js/tests/index.html: Replace jQuery event alias methods with functions that throw explanatory errors, instead of with undefined

Refs https://github.com/twbs/bootstrap/pull/19219#issuecomment-184653699

[skip validator]

add modal my gawd

To ensure that we don't accidentally use any of the aliases.
This should prevent any future regressions from #12761.
Also updates the test suite since it now can't use these aliases either.

[Fixes #15953] Implement `assert.expect` in each unit test

Since only on iOS tests fail when the fixture is displayed off-screen, see https://travis-ci.org/twbs/bootstrap/jobs/52605742

Refs http://qunitjs.com/upgrade-guide-2.x/#replace-qunit-log-callback-with-qunit-log-callback-for-all-reporting-callbacks