Postgres keywords added

Hi, 

This PR just adds some missing postgres keywords such as `ILIKE` and many more so cartodb's sql editor syntax highlight works a little bit better :smile: 

- The keywords were extracted from the official postgres documentation: http://www.postgresql.org/docs/9.0/static/sql-keywords-appendix.html and later filtered by @iriberri, as there were lots of them that are so infrequent.
- The simple script I've coded for this tasks is [here](https://gist.github.com/javierhonduco/1fe7fa9001e64412e9d6).
- In addition I've found a small typo in a storage unit util.

Keep mapping,