v3.0.0 RC 2

some small various fixes & new  adminlte:status command (#399)

* added classes for content-header & content

* fixed plugin selection for adminlte:plugins install

* moved compareDirectories to CommandHelper

* fixed brand-link classes

* first steps to adminlte:status command - reworked adminlte:install to share protected - created adminlte:status command

* added classes_brand_text option

* enhanced adminlte:status & a bit adminlte:install

* fixed ci

* removed --include-plugins placeholder option in adminlte:status