move ReadFile, WriteFile, and ReadDir into a separate io/ioutil package.
this breaks the dependency of package io on package bytes.
R=rsc
CC=golang-dev
https://golang.org/cl/163085
diff --git a/src/pkg/io/io.go b/src/pkg/io/io.go
index b389af4..c4850da 100644
--- a/src/pkg/io/io.go
+++ b/src/pkg/io/io.go
@@ -5,8 +5,7 @@
// This package provides basic interfaces to I/O primitives.
// Its primary job is to wrap existing implementations of such primitives,
// such as those in package os, into shared public interfaces that
-// abstract the functionality.
-// It also provides buffering primitives and some other basic operations.
+// abstract the functionality, plus some other related primitives.
package io
import (
