Made docstring more clear about values for the property. Updated property getting/dropping logic to be clearer. Dropped non-idiomatic use of pass in favour of continue.
Made docstring more clear about values for the property. Updated property getting/dropping logic to be clearer. Dropped non-idiomatic use of pass in favour of continue.

mapzen/TileStache,mapzen/TileStache,moskvax/TileStache,moskvax/TileStache,mapzen/TileStache,moskvax/TileStache