Add copyright note and license information

So anybody can just copy one of the files without worry to search for
license file.

format/formatter.go

@@ -1,3 +1,8 @@
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package format // import "eriol.xyz/piken/format"
 
 import "eriol.xyz/piken/sql"

format/formatter_test.go

@@ -1,4 +1,10 @@
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package format // import "eriol.xyz/piken/format"
+
 import (
 	"testing"
 

format/text.go

@@ -1,3 +1,8 @@
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package format // import "eriol.xyz/piken/format"
 
 import (

format/text_test.go

@@ -1,3 +1,8 @@
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package format // import "eriol.xyz/piken/format"
 
 import (

main.go

@@ -1,3 +1,8 @@
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package main // import "eriol.xyz/piken"
 
 import (

sql/sql.go

@@ -1,3 +1,8 @@
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package sql // import "eriol.xyz/piken/sql"
 
 import (

sql/sql_test.go

@@ -1,4 +1,9 @@
-package sql
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sql // import "eriol.xyz/piken/sql"
 
 import (
 	"io/ioutil"

utils.go

@@ -1,3 +1,8 @@
+// Copyright © 2015 Daniele Tricoli <eriol@mornie.org>.
+// All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package main // import "eriol.xyz/piken"
 
 import (