Use URLNormalizer as a submodule

1. Moved our altered map.csv out from url-normalizer.js library.

2. Use a forked version of URLNormalizer for now. Aim to use the
   original URLNormalizer library directly as submodule.

3. Implemented a setCSVMapPath() interface in URLNormalizer php
   library.

4. Use the setCSVMapPath() interface to call the altered map.csv
Merge pull request #8 from yookoala/altered_url_normalizer

Use URLNormalizer as a submodule