Fixes for the CLI

There were several methods that the CLI was using that didn't exist in the client.
From http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.7/:

9.7 DELETE
...
A successful response SHOULD be 200 (OK) if the response includes an entity describing the status, 202 (Accepted) if the action has not yet been enacted, or 204 (No Content) if the action has been enacted but the response does not include an entity.
...

If we're returning a 200 (the default, I believe) we should include some sort of parse-able response body. Otherwise we should switch the response code to a 204, and handle that case appropriately. This would be a https://github.com/stackdio/stackdio issue though.