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
Lots of unit tests for new WAMP classes
Fixed parse error in TopicManager
Aliased Topic::getId -> __toString to WampConnection can work with Topics or raw protocol strings
API docs
CS
BC break: Updated the `WampServerInterface` to have a strict API
Exclude and Eligible are now always arrays acting like black/white list
Changed `uri` to `topic` to be more generic with Pub/Sub
Added unit tests for `onPublish`
