Merge commit 'jc/maint' into gfi-maint

* commit 'jc/maint': (35 commits)
  Update git-http-fetch documentation
  Update git-local-fetch documentation
  Update git-http-push documentation
  Update -L documentation for git-blame/git-annotate
  Update git-grep documentation
  Update git-fmt-merge documentation
  Document additional options for git-fetch
  Removing -n option from git-diff-files documentation
  Start preparing for 1.5.1.3
  Sanitize @to recipients.
  git-svn: Ignore usernames in URLs in find_by_url
  Document --dry-run and envelope-sender for git-send-email.
  Allow users to optionally specify their envelope sender.
  Ensure clean addresses are always used with Net::SMTP
  Validate @recipients before using it for sendmail and Net::SMTP.
  Perform correct quoting of recipient names.
  Change the scope of the $cc variable as it is not needed outside of send_message.
  Debugging cleanup improvements
  Prefix Dry- to the message status to denote dry-runs.
  Document --dry-run parameter to send-email.
  ...