Make create action work on OSX.

OSX (and POSIX) sed doesn't have the "T" command.  Nor does find have
the -printf primary.  Replace these with an equivalant POSIX statement.

We are actually a bit more tight on the filename pattern match; we
require nine digits before the hyphen in the migration sql filename.
Fix another sed.
Fix yet another sed.  "shmig up" now works on OSX.
Merge branch 'master' into posix_create
Multiple command-line options work again.
Merge branch 'master' into posix_create
No -m for posix grep.

Removing it doesn't change behavior, just makes the script slightly
slower.
Merge pull request #3 from mbucc/posix_create

Create action works on OSX (and OpenBSD).