Merge branch 'prefetch-wip'

daemon/README.rst

daemon/bindings.c

daemon/bindings.h

daemon/bindings/kres.c

daemon/ffimodule.c

daemon/main.c

daemon/worker.c

daemon/worker.h

doc/modules.rst

lib/cache.c

lib/layer/rrcache.c

lib/rplan.h

lib/utils.h

modules/block/block.lua

modules/graphite/graphite.lua

modules/modules.mk

modules/prefetch/README.rst

modules/prefetch/prefetch.lua

modules/prefetch/prefetch.mk

modules/stats/stats.c