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