[WAMP] callError bugfix
[WAMP] callError bugfix

callError accepts `$errorUri` as per the specification
It has previously, erroneously, been changed to $topic
Now loosely accepts a URI but can be any data structure that can be json'd

If it is given a topic, as they're to be URIs according to the spec
it will be transformed to a string

b-viguier/Ratchet,KSDaemon/Ratchet,krageon/Ratchet,vinod1988/Ratchet,mbonneau/Ratchet,Jumplead/Ratchet,sudarshan955/Ratchet,IRlyDontKnow/Ratchet,ctkjose/Ratchet,cesarmarinhorj/Ratchet,Nek-/Ratchet,naroga/Ratchet,lyrixx/Ratchet,ratchetphp/Ratchet,zjien/Ratchet