Move shoulda.js checkout to tests/ folder.

Author: philc

.gitmodules

@@ -1,3 +1,3 @@
-[submodule "test_harnesses/shoulda.js"]
-	path = test_harnesses/shoulda.js
+[submodule "tests/shoulda.js"]
+	path = tests/shoulda.js
 	url = git://github.com/philc/shoulda.js.git

test_harnesses/automated.html

@@ -33,7 +33,7 @@
     <script type="text/javascript" src="../content_scripts/link_hints.js"></script>
     <script type="text/javascript" src="../lib/clipboard.js"></script>
     <script type="text/javascript" src="../content_scripts/vimium_frontend.js"></script>
-    <script type="text/javascript" src="shoulda.js/shoulda.js"></script>
+    <script type="text/javascript" src="../tests/shoulda.js/shoulda.js"></script>
     <script type="text/javascript">
       /*
        * Dispatching keyboard events via the DOM would require async tests,