don't use jquery anymore
remove rarely-used children_only parameter of query
restart from master version
remove children_only but without a bug
add initial filtering code
update readme for filtering
update demo
don't need jquery
update demo
update TODO
add filtering code to Quadtree constructor
update both query functions to use filters
update refine
add node_filter
add remove_by_filter and update remove_by_region
add to and update tests
Merge branch 'filtering'