Assert that an element is removed in ol.structs.RBush#remove_
Fix test description
Replace faulty iterative ol.structs.RBush#remove with less faulty recursive version
Return, and check, boolean value from ol.structs.RBush#remove indicating whether value was removed
Move remove from ol.structs.RBush to ol.structs.RBushNode
Merge pull request #1651 from twpayne/fix-rbush-remove

Fix ol.structs.RBush#remove