add barrier req/resp messages
Merge branch 'multipartReply' into barrier
export type t for MeterBand and Bucket module
Merge branch 'pretty_print' into barrier
fix 32 bit arch error
Merge branch 'master' into barrier
Merge branch 'master' into barrier

Conflicts:
	lib/OpenFlow0x04.ml
use type t in mli file
Merge pull request #140 from fugitifduck/barrier

Barrier