The backface of elements are now visible again thanks to many bizarre browser bugs in iOS/Chrome/FireFox
Merge pull request #164 from unify/fix/backface

The backface of elements are now visible again thanks to many bizarre ...
added lookup for existing widget/model combinations to speed up layout process while scrolling
delete model hashmap when setting a new model
Merge pull request #165 from unify/fix/virtualscroll

added lookup for existing widget/model combinations to speed up layout ...
added clearCache method
Merge pull request #167 from unify/fix/virtualscroll

added clearCache method
added addAfter and addBefore in MChildrenHandling
Merge pull request #168 from unify/fix/MChildHandling

added addAfter and addBefore in MChildrenHandling
Fix addAfter and addBefore from several mixins
changed popover to popup interface
Merge pull request #169 from unify/fix/popupinterface

changed popover to popup interface
fixed missing popup properties
Merge pull request #170 from unify/fix/popupinterface

fixed missing popup properties
Fix copy pasta error
Remove unused code
Fix widget handling in unlimited containers like scroller children container
Fix widget handling in unlimited containers like scroller children container