JtsGeometry.unwrapDateline should call geom.geometryChanged on GeometryCollections

[dsmiley]

The JtsGeometry constructor calls unwrapDateline(). If there are GeometryCollection (or subclasses) involved that has a geometry that crosses the dateline, the geom.geometryChanged() (which invalidates the envelope) is not called on the collection. The fix is to call it at the top level instead of at the component part level.

[sttawm]

It turns out that this change can cause a failure for direct instances (i.e. non-subclasses) of GeometryCollection, as they do not support the intersection() method, which may now be called in cutUnwrappedGeomInto360.

I've addressed this (and a few other things) in a fork, #84.