spine/spine — pull request #467 by adambiggs (2013-05-01 16:57:49+00:00)
Title: Set ajax URLs in method options

This is a reissue of #465 without the `relation.coffee` stuff.

It allows URLs to be overwritten in method options:

```coffee
Picture.first().updateAttribute 'title', 'lorem ipsum', { url: '/some/other/url' }
# PUT => `/some/other/url`
```