jquery source no longer present in jstree install

[ctgraham]

Release 3.0.0 of jsTree from the README is quite ancient:

Download/clone the jsTree library to sites/all/libraries/jstree. The module has been tested with the 3.0.0 release of jsTree.

Current releases of jsTree no longer distribute jQuery in the dist folder, as required here:

islandora_solution_pack_manuscript/includes/blocks.inc

Lines 30 to 32 in c0fee29

	"$library_path/dist/libs/jquery.js" => array(
	'group' => JS_LIBRARY,
	),

Distribution was last present in 3.0.4 and dropped in 3.0.5.