Missing options for simple_mercator_factory

[harmdewit]

The simple_mercator_factory and the SimpleMercatorProjector are missing options for like :wkb_parser, :wkt_parser, :wkb_generator, :wkt_generator. These options are only passed to the geographic companion factory, not the projected factory.

When using a projected column value i would like to get the ewkb value by using column.as_binary instead wrapping it in an unnecessary WKBGenerator .generate function.