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.
Getter and setter support for bindTo
Add tests for ol.Object#bindTo getters and setters
Remove 'valueAsNumber' property from ol.dom.Input

Use bindTo.transform functions instead
Notify target object after transform functions change
Merge pull request #1275 from fredj/bing_style_param

Rename ol.source.BingMapsOptions style property to imagerySet
Merge pull request #1198 from fredj/bindTo_transform

ol.Object#bindTo: getter and setter
Remove '(Optional)' from Description
Proj4js no longer needed for wmts-from-capabilities example

The WMTS capabilities document of the Vienna map has changed. It
no longer defines a tileset for EPSG:31256, so it can be parsed
without having Proj4js and a projection definition for
EPSG:31256.
Merge pull request #1280 from ahocevar/wmts-vienna

Proj4js no longer needed for wmts-from-capabilities example
Merge pull request #1278 from fredj/apidoc_optional

Remove '(Optional)' from Description
Default projection does not need to be provided

The wmts-from-capabilities example should focus on creating a
WMTS source from capabilities, so it should not distract by
configuring a projection that does not need to be configured.
Merge pull request #1281 from ahocevar/simplify-wmts-from-capabilities

Default projection does not need to be provided
Merge remote-tracking branch 'openlayers/master' into imagetile