Fixed #4 - Disable rewrite option for all but internal redirect

test/filterClasses.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 546 matching lines @@
   test.equal(Filter.normalize("||content.server.com/files/*.php$rewrite= $1"),
              "||content.server.com/files/*.php$rewrite=$1");
   test.done();
 };
 
 exports.testFilterRewriteOption = function(test)
 {
   let text = "/(content\\.server\\/file\\/.*\\.txt)\\?.*$/$rewrite=$1";
   let filter = Filter.fromText(text);
   test.ok(filter instanceof InvalidFilter);
+  test.equal(filter.type, "invalid");
+  test.equal(filter.reason, "filter_invalid_rewrite");
 
   text = "||/(content\\.server\\/file\\/.*\\.txt)\\?.*$/$rewrite=blank-text,domains=content.server";
   filter = Filter.fromText(text);
   test.ok(filter instanceof InvalidFilter);
+  test.equal(filter.type, "invalid");
+  test.equal(filter.reason, "filter_invalid_rewrite");
 
   text = "||/(content\\.server\\/file\\/.*\\.txt)\\?.*$/$rewrite=abp-resource:blank-text,domain=content.server";
   filter = Filter.fromText(text);
   test.equal(filter.rewriteUrl("http://content.server/file/foo.txt"),
              "data:text/plain,");
   test.equal(filter.rewriteUrl("http://content.server/file/foo.txt?bar"),
              "data:text/plain,");
 
   test.done();
 };
@@ skipping 20 matching lines @@
 
   test.notEqual(filter2.domains, filter5.domains);
 
   // Check twice for element hiding filters to make sure the internal cached
   // values are also not equal.
   test.notEqual(filter4.domains, filter6.domains);
   test.notEqual(filter4.domains, filter6.domains);
 
   test.done();
 };