Include a dictionary in priv/.

Travis-CI does not give us access to the unix word list, causing a build
failure. That's not awesome, but pulling up the unix word list did make the
project dependent on a POSIX system, perhaps unreasonably.

Anyway, now that we bundle the build on Travic-CI should be good.

Signed-off-by: Brian L. Troutwine <brian@troutwine.us>