Package tidy

- Modified the testing commands
- Added the requirements
- Moved python/tidy/tests to python/tidy/servo_tidy_tests for self tidy tests

python/tidy/servo_tidy_tests/speclink.rs

@@ -0,0 +1,9 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+impl SpecLinkMethods for SpecLink {
+    fn Test(&self) -> f32 {
+        0
+    }
+}