Config update to take advantage of new boundaries code.

[zerebubuth]

Depends on tilezen/TileStache#46.

Added example screenshot in parent #140.

@nvkelso could you review, please?

[nvkelso]

In keeping with the manta less layers, more stuff in the layers, I think these should end up in the same water layer they source from.

I'll have a separate comment about the kind transformations.

[zerebubuth]

The new features stay in the water layer, since I removed the new_layer_name parameter. See tilezen/TileStache#46.

[nvkelso]

• List of features matches those we test for in mz_calculate_is_water.
• Result goes back into the water layer.
• We add a new boundary=yes property.
• Decision about kind property value substitutions.