add role req and role resp message
Merge branch 'master' into roleRequest
pretty print function
Merge branch 'queueStruct' into roleRequest

Conflicts:
	lib/OpenFlow0x04.ml
	lib/OpenFlow0x04.mli
	lib/OpenFlow0x04_Core.ml
	lib/OpenFlow0x04_Core.mli
	quickcheck/Arbitrary_OpenFlow0x04.ml
Merge branch 'queueStruct' into roleRequest

Conflicts:
	lib/OpenFlow0x04.ml
use t reference
Merge branch 'master' into roleRequest

Conflicts:
	lib/OpenFlow0x04.ml
	lib/OpenFlow0x04.mli
Merge pull request #146 from fugitifduck/roleRequest

add role req and role resp message