Consolidate logger docs

util/logger/doc.go

@@ -1,6 +0,0 @@
-// Copyright 2016 The G3N Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package logger implements an hierarchical logger used by other packages.
-package logger

util/logger/logger.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// Package logger implements an hierarchical logger used by other packages.
 package logger
 
 import (