v2.0.0-alpha.6

Bug Fixes

• async-children: create observable for aysnc children only once (fixes #80) (c74e1b4)
• tree: option to have an empty folder node (no children) (ac4f777), closes #87

Features

• add cssClasses setting for folding elements and html templates for node and left menu activation elements (adc3c78)
• html value: render html properly in a node.value (baa62f4)
• tree: add left menu and an option to control availability of menus (1afb6fc)