Adds support for SQL Array

This is still a WIP, but I would like to get your feedback..

The only missing piece in the possible to get the basic to work and that I can start testing it is the mapping between List and java.sql.Array in line 153.

http://stackoverflow.com/questions/2880304/convert-java-util-liststring-into-java-sql-array

Would it be possible to get the jdbc.connection in the postgresqlDIOM?