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.
Rename layerFilter option to layers and accept array
Rename ol.source.BingMapsOptions style property to imagerySet

To match the Bing Maps terminology
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.
Merge pull request #1274 from tschaub/callback-count

Issue calls to get feature/info for all layers.
Merge pull request #1275 from fredj/bing_style_param

Rename ol.source.BingMapsOptions style property to imagerySet
Factor out ol.webgl.Context
Track current program in context, rather than renderers
Rename ol.renderer.Layer#renderFrame to prepareFrame
Add and use ol.renderer.webgl.Layer#composeFrame
Factor out layersToDraw
Add and use ol.renderer.canvas.Layer#composeFrame
Experimental canvas vector layer renderer
Use experimental canvas vector layer renderer
Add synthetic-data example