Signed-off-by: James Couball <jcouball@yahoo.com>

As described by git-rev-parse:
  Many Git porcelainish commands take mixture of flags (i.e. parameters
  that begin with a dash -) and parameters meant for the underlying git
  rev-list command they use internally and flags and parameters for the
  other commands they use downstream of git rev-list. This command is
  used to distinguish between them.

Using the `--` to separate revisions from paths is at the core of git.
I do not think this behavior will ever change.

The message without the extra parameters:
  fatal: ambiguous argument 'v3': unknown revision or path not in the
  working tree.
  Use '--' to separate paths from revisions, like this:
  'git <command> [<revision>...] -- [<file>...]'

The message with new parameters:
  fatal: bad revision 'NOTFOUND'

I think it's way more descriptive.

Signed-off-by: James Couball <jcouball@yahoo.com>