add missing license headers in a few files

github/git_blobs_test.go

@@ -1,3 +1,8 @@
+// Copyright 2014 The go-github 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 github
 
 import (

github/repos_contents_test.go

@@ -1,3 +1,8 @@
+// Copyright 2014 The go-github 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 github
 
 import (

github/search_test.go

@@ -1,3 +1,8 @@
+// Copyright 2013 The go-github 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 github
 
 import (

tests/integration/doc.go

@@ -1,3 +1,8 @@
+// Copyright 2016 The go-github 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 tests contains integration tests.
 //
 // These tests call the live GitHub API, and therefore require a little more