Patch for PostgreSQL and MySql

David Croy made some fixings and improvements to the release 2.7 that let users use the jdbc access with postgresql and mysql.
Note that to use postgresql you must use the development driver supplied with this patch.

------------------------------------------------

Here are the release notes from David:

* Various fixes to work with postgres and mysqlj dbc drivers.
* Added a Row field in the data query panel. This allows for setting the max rows for a query.
* If a table has more than four columns add Horizontal Scrollbars.
* Don't query the data from a table until the data tab is selected.
* Moved AbstractLang.java to druid.interface. Allows modules outside of the druid package and use it.
* Added the remarks column to the table structure.
* Added a mysql comment type.
* Added a mysql and postgres sql generator. The postgres one allows for adding the descriptions to the database.
* In the Options->Generation. Enable the options button if needed.
* Created and ant build file.
* Include a development version of the postgresql driver. (It works for me YMMV).