first draft of atheme migration code

vendor/github.com/GehirnInc/crypt/common/doc.go

@@ -0,0 +1,10 @@
+// (C) Copyright 2012, Jeramey Crawford <jeramey@antihe.ro>. All
+// rights reserved. Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package common contains routines used by multiple password hashing
+// algorithms.
+//
+// Generally, you will never import this package directly. Many of the
+// *_crypt packages will import this package if they require it.
+package common