Update OpenLayers.Layer.Bing.serverResolutions

It seems that OpenLayers.Layer.Bing.serverResolutions is not up to date with the resolutions currently provided by Bing:
http://msdn.microsoft.com/en-us/library/bb259689.aspx

The section "ground resolution and map scale" lists 23 resolution values between 78271.5170 and 0.0187, while OpenLayers.Layer.Bing.serverResolutions still contains 22 values between 156543.03390625 and 0.07464553542435169.