Fixes #3042: `yii\widgets\Pjax` should end application right after it finishes responding to a pjax request

issue #3026

fixes #1946

issue #2852

this term is resolveable by the php docs when linking types in apidoc

We are now maintaining a fork of pjax:
https://github.com/yiisoft/jquery-pjax

for prev, next, first and last page.
http://www.w3.org/TR/html401/struct/links.html#h-12.1.2

Fixes #2544: Changed `DetailView`'s `name:format:label` to `attribute:format:label` to match `GridView`

Pjax inserts the response HTML into the container, it doesn't replace it.
So any subsequent pjax requests duplicate the container.

fixes #2367