Support Array of Geometry and Geometry as Struct

[randallwhitman]

If Multi-part geometry could be returned as a hive Array of single-part geometries, the array could be used with explode() - this may provide one possible solution to the objectives behind issue #35 .

While struct is mentioned in issue #9 in the context of import from JSON, structs could be useful in a more general context.

Point could be a structure of x, y [,z] [,m] .
Structure for Polygon would take more thought.