Removed edited author ref.

Updated tabs

Corrected the example and doc to highlight allowed dropdown support in Bootstrap 3.

fixes #1284

"yii\swiftmailer\Mailer" transport setup has been advanced to support constructor arguments and plugins.

Fixes #1222: removed Slider widget from JUI extension since it's not input widget and a wrapper doesn't really add anything

code style section has been added here:
https://github.com/yiisoft/yii2/wiki/Core-framework-code-style#self-vs-static

verification code for properties:
https://gist.github.com/cebe/7566916

I accidentally made this pull request in the read-only JUI repo, so I'm doing it again here.

also removed superflous minimum-stability definition

This reverts commit 7d6d01b4.