Label for VM Deployment should not be b64 encoded.
Updates storage api version to 2012-02-12
- Adds more lease functionality
- Allows cross-storage account blob copy
- Adds a helper function make_blob_url to pass to copy_blob for x_ms_copy_source
Fixes WindowsAzureConflictError and WindowsAzureMissingResourceError to properly set the error message, and use the additional info returned by the server
Merge pull request #125 from MSOpenTech/vm-label-b64

Label for VM Deployment should not be b64 encoded.
Added some additional checks in the unit test to verify correctness of label for create_virtual_machine_deployment.
Removed misleading references to base 64 encoding for several parameter descriptions where the user doesn't need to do any encoding/decoding.  They could be mislead into doing it themselves, resulting in double encoding/decoding.