Merge branch 'jc/submittingpatches'

* jc/submittingpatches:
  Documentation/SubmittingPatches - a suggested patch flow
  Documentation/SubmittingPatches: What's Acked-by and Tested-by?
  Documentation/SubmittingPatches: discuss first then submit
  Documentation/SubmittingPatches: Instruct how to use [PATCH] Subject header