3.0.0-beta10

• added get_top_selected & get_bottom_selected functions
• contextmenu label can now be a function
• avoided infinite loop in set_state if persistent AJAX error occurs
• a lot of fixes to load_node to allow proper reloading and data handling
• jstree now allows duplicate IDs on page level (but not in the same tree), basically you can have the same node ID in different trees now
• invalid IDs are now supported (numeric, etc)
• check_callback now receives one more param with additional info (useful for drag'n'drop)
• nodes with state.opened set to true, which are not loaded, are now automatically loaded when needed
• HTML string as data now works properly
• unloaded nodes are now properly copied as "closed" (instead of leaf)
• added optional position parameter to paste function
• is_draggable in DND now handles multiple nodes properly
• close_node.jstree event is no longer triggered if the node is already closed