* Deserialize additionalInfo in ARM error

* Allow a new authorizer to be created from a configuration file by specifying a resource instead of a base url.

This enables resource like KeyVault and Container Registry to use an authorizer configured from a configuration file.

* [WIP] Using the Context from the timeout if provided (#315)

* Using the timeout from the context if available

- Makes PollingDuration optional

* Renaming the registration start time

* Making PollingDuration not a pointer

* fixing a broken reference

* Add NewAuthorizerFromCli method which uses Azure CLI to obtain a token for the currently logged in user, for  local development scenarios. (#316)

* Adding User assigned identity support for the MSIConfig authorizor (#332)

* Adding ByteSlicePtr (#399)

* Adding a new `WithXML` method (#402)

* Add HTTP status code response helpers (#403)

Added IsHTTPStatus() and HasHTTPStatus() methods to autorest.Response

* adding a new preparer for `MERGE` used in the Storage API's (#406)

* New Preparer/Responder for `Unmarshalling Bytes` (#407)

* New Preparer: WithBytes

* New Responder: `ByUnmarshallingBytes`

* Reusing the bytes, rather than copying them

* Fixing the broken test / switching to read the bytes directly

* Support HTTP-Date in Retry-After header (#410)

RFC specifies Retry-After header can be integer value expressing seconds
or an HTTP-Date indicating when to try again.
Removed superfluous check for HTTP status code.

* v12.2.0