Adds TooManyRequests (429) exception #304
                
     Merged
            
            
          
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Adds a new exception class, ActiveResource::TooManyRequests, for 429 Too Many Requests, see RFC 6585 -Additional HTTP Status Codes - section 4. which subclasses ActiveResource::ClientError which would have been returned before.
As a parallel to #302
Cheers!