strings.Split: make the default to split all.
Change the signature of Split to have no count,
assuming a full split, and rename the existing
Split with a count to SplitN.
Do the same to package bytes.
Add a gofix module.

R=adg, dsymonds, alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/4661051
diff --git a/src/cmd/gofmt/rewrite.go b/src/cmd/gofmt/rewrite.go
index 4c24282..f7f1fe8 100644
--- a/src/cmd/gofmt/rewrite.go
+++ b/src/cmd/gofmt/rewrite.go
@@ -22,7 +22,7 @@
 		rewrite = nil // disable any previous rewrite
 		return
 	}
-	f := strings.Split(*rewriteRule, "->", -1)
+	f := strings.Split(*rewriteRule, "->")
 	if len(f) != 2 {
 		fmt.Fprintf(os.Stderr, "rewrite rule must be of the form 'pattern -> replacement'\n")
 		os.Exit(2)