Fix hasChildren() when children = []

Close #316
getNodeByKey casts key to a string

Close #320
Fix quick edit mode sample
Define a main entry point
Fix ajax LoadError not updated in StatusNode with Table ext

Close #237
Merge branch 'master' into wide2

Conflicts:
	src/skin-common.less
	src/skin-lion/ui.fancytree.css
	src/skin-vista/ui.fancytree.css
	src/skin-win7/ui.fancytree.css
	src/skin-win8-xxl/ui.fancytree.css
	src/skin-win8/ui.fancytree.css
	src/skin-xp/ui.fancytree.css