Removing example
Remove ol.layer.Vector2 and associated renderer
Remove ol.source.Vector2
Remove ol.geom2
Merge pull request #1109 from tschaub/geom

Remove ol.geom2.
Merge pull request #1273 from tschaub/select-layers

Rename layerFilter option to layers and accept array for select interaction.
Determine the callback count while iterating through all layers

Previously, if a layer didn't have a `getFeature*ForPixel` type method, the loop count would be decremented.  This means that all layers would not be considered.  Instead, the callback count should be incremented before requests are made and decremented in the callback.