Fix KML, CSV, Shapefile exports for more fields

Update to 403feca81655371af4fe09c8fa22f70d02d8daa7 and
bf82676a7be8626831d2ac454f7a10ae63e4fc4c. After these commits,
Last Updated By, Tree Owner, Sponsor, Entered By were still
broken.
Merge pull request #107 from steventlamb/bug/fix_user_fields_in_export

Fix KML, CSV, Shapefile exports for more fields