Box widget improvement

Fix Metis Menu active items highlighting

Merge branch 'master' of https://github.com/mikbox74/yii2-chl

README updating

- Fix layout overriding

- The layout is sidenav wuth fixed header and footer by default

- Fix the Message widget

- Now the auth layout can display flash messages too

- Fix of grid sorting icons

- Fix of ChaldeneHelper::widget method

 - Decorators

 - View file for Logo widget