Optim Add destroyAll method to WidgetParent to prevent memory leaks when using removeAll alone
Merge branch 'master' of github.com:Heigvd/Wegas

Conflicts:
	wegas-app/src/main/webapp/wegas-editor/js/util/treeview.js
	wegas-app/src/main/webapp/wegas-editor/js/widget/wegas-editor-pagetreeview.js
Fix IE8 issue on login page
Fix issue in wegas-tab.js destruction
Fix Tinymce destruction issue