Unclear error messages

[jimmypoulsen]

When getting an error from the API (eg a "400 Bad Request") we assign three things in the error instance:

• message
• status
• data

message is set to response.message (response is a Net::HTTPResponse object) and consists of the actual HTTP error (eg "Bad Request"). IMO this is where things get a bit unclear. We already have the status (eg 400) so I don't believe the "Bad Request" is necessary. We should simply assign the API response to the message so we can use the great error messages the API generates.