[PATCH 0/2] Support for packs in HTTP

This series has one patch which is ready to go in and one that's not (although it's a reasonable phony for the current state of the git world).

 1: Several additional functions are needed in the library to support
    progressively getting pack data from some remote location and using it
    to determine what else to get.

 2: git-http-pull can get packs as appropriate by getting all the index
    files first, and then using them to figure out whether the object it's
    looking for is in some pack it could get.

Currently, there's no sane way to figure out what pack/index files are available from an HTTP server. But there only seems to be one pack file available on an HTTP server at the moment, so this tries to get that one.

	-Daniel
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