Add support for Terraform files

testdata/expected/file.tf

@@ -0,0 +1,17 @@
+/**
+ * Copyright 2016 Google Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+resource "null_resource" "dummy" {}

testdata/initial/file.tf

@@ -0,0 +1 @@
+resource "null_resource" "dummy" {}