Make self rels a resource level function call

[ifandelse]

@dcneiner's great suggestion:

board.self({ id: 101 }); should just be board({ id: 101 });

[ifandelse]

@arobson The ideas I spiked out earlier today worked to a limited degree, but I'm going to start over with a better (hopefully) approach. Turning resources into functions is, IMO, a great idea, BUT it will break a ton of our tests that are doing deep equal comparisons on objects at the moment. I'd like to have this in for v0.1, but will take me a couple of days at least.