[PATCH 0/5] Ref log updates

The following series of patches applies on top of 'pu' and my prior series of ref log related patches.

Most of these are bug fixes and test cases.

* [PATCH 1/5] General ref log reading improvements.

	Performance improvements and minor bug fixes in the log
	parser.

* [PATCH 2/5] Added logs/ directory to repository layout.

	Minor documentation update that I missed in the last round.

* [PATCH 3/5] Force writing ref if it doesn't exist.

	If a ref doesn't exist make sure we write it anyway.
	I found a few cases were we weren't writing the ref; this
	appears to have it fixed.

* [PATCH 4/5] Log ref updates made by fetch.

	Fully enable ref logging for the *-fetch family of tools.

* [PATCH 5/5] Change 'master@noon' syntax to 'master@{noon}'.

	Support parsing ':' in date strings correctly, especially
	in the face of 'master@2005-06-12 16:12:foo'.