Update the copyright header to include 2015 and the ASF.

Tests/RequestTests.swift

@@ -1,6 +1,6 @@
 // RequestTests.swift
 //
-// Copyright (c) 2014 Alamofire (http://alamofire.org)
+// Copyright (c) 2014-2015 Alamofire Software Foundation (http://alamofire.org)
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal