Added CloudBlobProxy

for working with blobs as easily as tables and queues.  Automatically
serializes and deserializes entities into blobs.
NuGet 1.2.5 - fix CloudTableProxy, CloudBlobProxy

* CloudTableProxy delete now properly expects status code 204 (No
Content).
* CloudBlobProxy now tested in live application.  Removed Folder Func.
Instead set any desired folder path in the BlobName Func.
* new validation functions added for blob container names and blob
names, used by CloudBlobProxy.
* versioned as 1.2.5.0.  The 5 point revision increase (from 1.2.0.0) is
due to multiple unreleased internal versions until all functions passed
tests.