Added Cytoscape 2.2.12
Moved Javascript libraries (Ext, jQuery, Cytoscape, etc.) into centralized location in core/js/libs/

Also added Ext-based javascript classes from Walker into core, which will serve as the app baseline
Fixed spelling of "Hierarchical" (again)
Removed customer-specific legend definitions
Deleted the old legendDefs.js and renamed the most up-to-date WalkerLegendDefs.js to replace it