Show an issue with ol.structs.RBush

Note that the same test passes in the original implementation.
Do not ascend when node has more siblings
Verify that removing random extent nodes also works
Truthy check is enough
Merge pull request #1373 from ahocevar/rbush-fail

ol.structs.RBush#remove() is unreliable
Add collinsBart and ordnanceSurvery styles to bing-maps example
Merge pull request #1392 from twpayne/bing-uk-maps

Add collinsBart and ordnanceSurvery styles to bing-maps example
Merge remote-tracking branch 'openlayers/master' into vector-api