rework exceptions handling

[frantisekrokusek]

Hello guys,

Sometimes you server sends unexpected errors.

I took the opportunity to rework your error handling to send more appropriate responses.

Bellow as there is no log_id AND there is no meta field, the gem returns a errors array that contains nil. In that case we loose the errors informations...

{
  "status"=>500, 
  "code"=>"[FILTERED]", 
  "errors"=>[
    {"code"=>"[FILTERED]", 
     "title"=>"Unknown Error", 
     "message"=>"An unknown error has been encountered. Please try again in a few moments."}
   ]
}