Add ol.extent.extendXY
Fix order of arguments to ol.extent.createOrUpdate
Add more extent functions
Add ol.extent.extendFlatCoordinates
Add ol.extent.createOrUpdateFromFlatCoordinates
Return extent from ol.extent.extend
Add ol.extent.getArea
Add ol.extent.getEnlargedArea
Add ol.extent.getIntersectionArea
Add ol.extent.getMargin
Add optional destination argument to ol.extent.clone
Add ol.structs.RBush
Add ol.structs.RBush#assertValid
Refactor ol.structs.RBush tests
Don't check for under-full nodes when validating ol.structs.RBush

Removal can lead to under-full nodes.
Implement ol.structs.RBush#remove_
Add FIXME
Add ol.structs.RBush#update
Clone extents in ol.structs.RBush to prevent modification
Merge pull request #1316 from tschaub/rbush

Add adapted version of rbush.