Support for 9.1 foreign tables

Hi,

I just tried out the 9.1 driver (build 900) and noticed that it does not yet return the correct type for foreign
tables.

I have created a foreign table using the wrapper for text files (using the example here:
http://www.depesz.com/index.php/2011/03/14/waiting-for-9-1-foreign-data-wrapper/comment-page-1/#comment-33414),and when
usingDatabaseMetaData.getTables() the returned type for that table is null. I assume that should contain "foreign
table"to be inline with psql's display. 

The same is true for DatabaseMetaData.getTableTypes()

I just wanted to mention it, to make sure that it's not forgotten ;)

Regards
Thomas