set redshift postgres driver to a new version with better unicode support
version is now 2.5.2-wip
update CHANGES.txt with new redshift jdbc driver
reduce size of tests jars dramatically
added conjars as source for s3 upload library
added replaceOnInsert support for MySQL. Thanks to Jonathan Coveney/@jcoveney. https://github.com/Cascading/cascading-jdbc/pull/11
assume tables are discoverable by query unless specifically told they aren't
version 2.5.2