Remove mapnik.vector namespace

[kkaefer]

Any reason we need this namespace? Afaik, this is just used to ensure the namespace when using protoc to generate bindings.

[springmeyer]

I agree, we can rename to something generic (non-mapnik) now that this spec is coming to fruition. I think some namespace is a nice thing for the C++ bindings. What about mapnik.vector -> vector_tile at

vector-tile-spec/1.0.0/vector_tile.proto

Line 3 in 5e19d44

package mapnik.vector;

?

[pramsey]

How about "map.vector", so this become the "map vector tiles" spec.

[kkaefer]

vector_tile sounds good. If we use . as a separator (like map.vector) the namespace will become namespace map { namespace vector { which is a little awkward.