Adds MIT license

sse-encoder.go

@@ -1,3 +1,7 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
 package sse
 
 import (

sse_test.go

@@ -1,3 +1,7 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
 package sse
 
 import (