Merge branch 'mw/sendemail'

Merge branch 'mw/sendemail'

* mw/sendemail:
  bash completion: Add --[no-]validate to "git send-email"
  send-email: signedoffcc -> signedoffbycc, but handle both
  Docs: send-email: Create logical groupings for man text
  Docs: send-email: Create logical groupings for --help text
  Docs: send-email: Remove unnecessary config variable description
  Docs: send-email: --chain_reply_to -> --[no-]chain-reply-to
  send-email: change --no-validate to boolean --[no-]validate
  Docs: send-email: Man page option ordering
  Docs: send-email usage text much sexier
  Docs: send-email's usage text and man page mention same options