code: function commitAllChanges(msg) {
      return vowExec(util.format('git commit -a -m "%s" -n', msg))
          .fail(function (res) {
              return vow.reject('Commit failed:\n' + res.stderr);
          });
  }
docs: Commits changes in tracked files.
  
  @param {String} msg Commit message.
  @returns {vow.Promise} Promise that'll be fulfilled on success.