added license header

lib/rack/arachni-vectorfeed.rb

@@ -1,3 +1,19 @@
+=begin
+    Copyright 2010-2012 Tasos Laskos <[email protected]>
+
+    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.
+=end
+
 require 'rack/utils'
 require 'yaml'
 # require 'ap'