Fixed: TableStorage to work with AzureTableStorage clinet version 3.x

TableStorage now throws exception witch contains json instead of xml.

There are still test fails for Queues and Blobs. I could probably also fix these but havent worked with either of them ... but it might be something also the same with the xml changed to json in the Message of the exception.

The current version should probably depend on Microsoft.WindowsAzure.Storage < Version=3 and the new should depend >= Version 3.

Let me know what you think.