Updated CompleteRelation to not care if some of the members are not present. If we are working with a subset of OSM data, this is most defintely going to be the case.
SimpleGeometryInterpreter will now auto-close non-complete rings. This is needed to properly render relations that have only part of the data (for example, a body of water that is cut off by the OSM data bounds). Not sure if this change will cause issues elsewhere.
MapCSSInterpreter was basically skipping all relations due to keys, etc. Commented this out as TranslateRelation currently does nothing. I'm more interested in processing the internal geometries of the relation.

Changed offsets used for vertical text anchoring.