JSTPMessage as the argument

[xaviervia]

The idea is to have only one argument rather than the three currenctly used for the callbacks.

JSTPMessage.

JSTPMessage will contain:

• engine: The JSTPEngine
• answer: if this is an ANSWER Dispatch, the Dispatch. Otherwise, null (or undefined)
• dispatch: if this is a regular dispatch, the Dispatch. Otherwise, null (or undefined)
• params: the named params identified by matching a Named Endpoint Resource Pattern with the incoming Dispatch. Empty if none

The JSTPMessage could of course contain a lot more stuff, but this suffices for 0.5

[xaviervia]

Moved to https://github.com/jstp/jstp-engine/issues/4