(commit or discard the untracked or modified content in submodules)
   submodules/escape_sequence (new commits)
   submodules/evernote_mail (new commits)
   submodules/gtask (new commits)
   submodules/multi_clipboard (new commits)
   submodules/sd_cl (new commits, untracked content)
   submodules/sentaku (new commits)
   submodules/stow_reset (new commits)
   submodules/trash (new commits), from darwin13