Add support for mp q=config destination

[EdwardHinkle]

Add support for mp q=config destination

[aaronpk]

This is exciting. This will motivate me to work on the multiple destination support I have in mind for my website!

[RosemaryOrchard]

Maybe we need to set a standard for defaults? In the endpoint I've been writing if no destination is set I have a default one in the background, and that should be the first one returned in the destination list - unless said list gets alphabetised of course.

As I see it, it might be goo to have 2 defaults: One returned by your endpoint, and one stored in Indigenous (so by default my endpoint might post to /micro but I want Indigenous to post to /links.

Of course, supporting the destinations which are attached to the channels in Aperture would be nice too, and remove the need for default handling on your end perhaps?