Use isDir in in place of FileSystem.isDirectory in FilesDataSource::open
Merge pull request #48 from mikedotalmond/master

Use isDir in in place of FileSystem.isDirectory in FilesDataSource::open
Merge pull request #44 from ProG4mr/master

PanelList added.
Added support for different button layouts.
Merge remote-tracking branch 'Harrigan/master'
Accordion/PanelList update
Image not longer automatically disposes bitmap
Initial support of virtual scrolls on scrollviews

(Will be later needed for tableview/listview virtual scrolling)
Cleanup
Allow drag scroll for virtual scroll scrollviews
Added extendablepanel.

Removed panellist.
Reverted accordion.
Vertical layout ignores invisible.
Layouts children visibility support.
Accordion uses visibility instead of add/remove child.
Checkbox Event.CHANGE fixed.
Added child percentWidth to horizontalContinuousLayout.
Merge remote-tracking branch 'Harrigan/master'

Conflicts:
	samples/expandable_panel/application.xml
	src/haxe/ui/toolkit/containers/Accordion.hx
	src/haxe/ui/toolkit/containers/PanelList.hx
	src/haxe/ui/toolkit/controls/Image.hx