Merge pull request #58 from ProG4mr/master

ExtendablePanel, layout child visibility and others.
Accordion fix for allowing selection before ready

(and haxelib)
Style updates
Small haxeui fixes
Minor fixes
Preliminary component cloning
Accordion can be cloned
Cloning is now macro based
Doc update
Removed YAHUI link
Removed test meta tag
doc update
ListView uses item renderers
Improved popups
Fixed #63
Small improvement for item render components
doc update
Fixed #67
ListView/Popup fixes
Fixed selection bug