Allow quantization to be disabled.

This is useful if you want to control the behavior of quantization yourself;
instead of quantizing, topojson.topology will assume input coordinates are
already integers and do not need to be modified.
Fix #37; add topojson.feature.

This deprecates topojson.object, replacing it with a method that returns proper
GeoJSON rather than a hybrid between TopoJSON and GeoJSON.
Rewrite object tests for feature.
Rewrite bin/geojson to use topojson.feature.
Remove straggling usage of topojson.object.
Restore support for --id-property.
Remove topojson.object; bump to 1.0.0.

This wouldn’t have been backwards-compatible anyway because it changed the
behavior of topojson.object, removing propagation of id and properties. Rather
than drag the old method along, now seems as good a time as any to call this
version 1.0.0 of the client API reference—there are quite a few users already!
Merge branch 'feature'
Organize spherical code.
Checkpoint broken implementation.
Fix bugs and add tests for hashtable.
Closer.
Better handling of closed lines.
Fix arbitrary shared starting point.
Add a failing test.
Ignore properties when -p is false.
Delete duplicate test.
On second thought, we need the id.
Fix package.json.
Checkpoint hashtable implementation.