JSON/HTML header no longer needed if dataType is set
more fixes to invalid IDs
added closing DIV to demo
added before_open event - closes #626, closes #481
fix for prototype's horrible prototype overrides - close #627
more fixes for invalid IDs and the reference function
search leaves only option added to search - close #634
added additional check in core and removed console.log from types
added jstree-file and jstree-folder icons (easy to use with types)
getElementById instead of querySelector for IE7 (not supported) #636
added is_multi property when dnd calls check_callback
added is_foreign and is_multi to all move_node & copy_node checks
fixes to server side undetermined state
added dnd always_copy setting
removed all references to vakata_reverse (prototype errors)
added _load_nodes and refresh_node - close #638
can now move nodes with same IDs between trees - close #641
core check function now respects multi tree moves
added option to set search.ajax to a function
remove pointer cursor from open/close icon on leaf nodes - close #644