3.0.0-beta4

Thanks to everyone for reporting, here is a list of fixed issues and changes:

• added option to disable responsive theme
• fixes to open_all and open_node
• foreign objects can now be dropped on the tree
• fixes to loading icon and nodes without icons - both are drawn properly now regardless of theme
• state is preserved correctly with HTML data source on refresh
• fixes to wholerow plugin which prevented the tree from destroying
• create_node now works properly with before and after positions
• fixed missing dependency in package.json
• jstree now automatically handles the dreaded "d" property wrapper, inserted by .net