Update postgis queries on imagemosaic-jdbc to work with postgis v2.0+

change asbinary to st_asbinary (Import) and geomfromwkb to st_geomfromwkb (Import and JDBCAccessPostGis)

(problem reported at this geotools-gt2-users' thread http://sourceforge.net/mailarchive/forum.php?thread_name=CAK2H3M12HNvvB4CMnMNeRJbpri54RBs7RjcoZOoWtwXR%2Bjs27w%40mail.gmail.com&forum_name=geotools-gt2-users )