#1818: geohash patch hashbox to geom

git-svn-id: http://svn.osgeo.org/postgis/trunk@11341 b70326c6-7e19-0410-871a-916f4a2858ee
#1818: oops forgot to add the tests

git-svn-id: http://svn.osgeo.org/postgis/trunk@11342 b70326c6-7e19-0410-871a-916f4a2858ee
#1818: geohash one more file forgot to commit.

git-svn-id: http://svn.osgeo.org/postgis/trunk@11343 b70326c6-7e19-0410-871a-916f4a2858ee
#1818 credit updates J. Smith (also fix web link in CREDITS file)

git-svn-id: http://svn.osgeo.org/postgis/trunk@11344 b70326c6-7e19-0410-871a-916f4a2858ee