Add styles for .ol-touch .ol-zoomslider
Fix zoomslider controls to match zoom controls more closely
Update the zoomslider example to have better styling for touch devices
Update zoomslider custom styling to match control styling changes
Do not update RTree while dragging vertices
Skipped features replaces RenderGeometryFunction
Update select-features example styles
Skip features in select interaction
Check for null layers (for postcompose hitdetection)
Map stores skippedFeatures instead of layers
Name frameState skippedFeaturesIds as private
Trigger render on skippedFeatures change
Merge pull request #1875 from ahocevar/modify-performance

Do not update RTree while dragging vertices
Move function declaration out of the constructor
Store touch coordinates as ol.Pixel instead of goog.math.Coordinate
Cache the result of goog.object.getCount
Remove trailing newlines
Remove unused ol.pointer.PointerEvent#originalEvent
Use a hash to store features uids
Coding style