Check resources length of first resource set (see #1149)
Use permanent Bing Maps API key

This key is registered for "Not-for-Profit" use by OpenLayers as a project of OSGeo - a 501(c)(4) organization.

See the complete [Terms of Use](http://www.microsoft.com/maps/product/terms.html) under the Eduction or Non-Profit Organization Use section.
Merge pull request #1150 from tschaub/bing

Use permanent Bing Maps API key.