Initial implementation of Glimpse.WindowsAzure and Glimpse.WindowsAzure.Storage

Initial implementation of Glimpse.WindowsAzure and Glimpse.WindowsAzure.Storage. This implementation provides two new packages:

* Glimpse.WindowsAzure - provides runtime environment information when running on Windows Azure Cloud Services or Windows Azure Web Sites.
* Glimpse.WindowsAzure.Storage - provides insights into your Windows Azure Storage (tables, blobs, queues) consumption.

Note that for gaining insights into Windows Azure Storage, the OperationContext parameter has to be specified explicitly **for every call to storage**. This requirement will be removed with later versions of the Windows Azure Storage SDK but for now it is required.

Example:
```
            // Perform operations on Windows Azure storage
            var account = CloudStorageAccount.DevelopmentStorageAccount;
            var blobclient = account.CreateCloudBlobClient();

            var container1 = blobclient.GetContainerReference("glimpse1");
            container1.CreateIfNotExists(operationContext: OperationContextFactory.Current.Create());

            // ...
```

Beta packages can be found on the following MyGet feed: https://www.myget.org/F/glimpse-windowsazure/