[dm-cache] link to the test suite in dm-cache.txt
[dm-cache] rename 'writeback' policy to 'cleaner'
dm cache: a few dm-cache.txt fixes
manually applying ejt/thin-dev conflicts before pulling
Merge branch 'thin-dev' of git://github.com/jthornber/linux-2.6 into thin-dev

Conflicts:
	Documentation/device-mapper/cache.txt
	drivers/md/Kconfig
	drivers/md/dm-cache-policy-cleaner.c
dm thin: small consistency fixes for metadata resize changes