[PATCH 0/4] Pulling refs files

This series makes the following changes:

 1: Adds support for having the C code know about the general existance of
    .git/refs, and functions for writing these files.
 2: Adds support in the generic pull code for fetching refs (and dummy
    implementations).
 3: Adds support in the HTTP pull code for fetching refs
 4: Adds support in the rsh pull code for fetching refs; this requires
    changes to the protocol. These changes should be sufficient to support
    any future extension, however.

	-Daniel
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