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Add pull method to models for bulk ajax fetches
`.pull` is like `.fetch` with three differences: * it uses jquery's getJSON (bypassing the internal spine query queue) * it can pull one or multiple ids from a server * it has straightforward success/failure callback parameters Why all this? Firstly, I like to pull in records quickly when needed, so I think the internal queue is unecessary for quick gets. Think: youtube frontend (unlimited data with selective gets) instead of a tiny contact DB or calendar where pagination or fully loading the dataset makes sense. Secondly, I'd like to pull in one or multiple items at a time. If I set the pull id to 1,4,5,6,7 the server can parse the special id and return multiple results from one request. Alternatively, a list of multiple IDs can be passed in and they will be grabbed individually. Thirdly, simple callbacks make me happy. Attaching handlers to an extra options parameter feels like using YUI in 2006.
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