fix typo
fix occasional exception
added missing jquery-datatable constant - and renamed file to correct typescript naming conventions
isolate the fix for #22 for the jetty file lock - limit the change to windows only
initial support for lazy loading of tree nodes for cases where a node has lazy loaded children for #220. Works OK but currently it would be nice to know up front which nodes have a lazy load handler registered; so we can set the lazy loading flag accordingly; to make sure things which will never be a folder appear as a leaf