Allow API implementations to handle errors

[stuntguy3000]

By printing errors to console, it means API implementations cannot properly handle any errors.

My suggestions are to either throw an exception, or have a onError event for the implementation to listen for.

[aaomidi]

onErrorEvent is a bad idea.

Exceptions are made for this. +1 for Exceptions.

[zackpollard]

This will be implemented in one of the coming updates, it is something I have intended to do from the very beginning but I personally believed getting a full bug free implementation was important first. Will update this once this has been implemented.