BlobStore API for Orion based back-ends

Apache requirements for headers are quite strict. For this to be contributed to Apache jclouds I believe you need to follow http://www.apache.org/legal/src-headers.html (i.e. move copyright into the NOTICE file, and just have the standard apache header - copy the header from any of the Java files in https://github.com/jclouds/jclouds/).