misc/vim: limit Fmt command to Go buffers.
misc/vim: limit Fmt command to Go buffers.

R=golang-dev, dsymonds
CC=golang-dev
http://codereview.appspot.com/4548072

Committer: David Symonds <7f6bb564ed9e580d4f0aa90d53b34578e5d24cb9@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go