Anchor the popup to the top of the icon
Roy G. Biv
Don't render feature with all countries

The feature with undefined id is a multi-polygon representing all countries.  Instead of rendering all multi-polygons with a lower z-index, we just avoid rendering this single feature.
Merge pull request #1666 from tschaub/topojson-tweak

Don't render feature with all countries.
Merge pull request #1665 from tschaub/roy-g-biv

Roy G. Biv.
Merge pull request #1663 from tschaub/popup

Fix popup anchor in icon example.
As it is currently used, opt_options is not optional

It would be nice if the compiler would warn us of things like this (accessing properties of undefined).
Merge pull request #1670 from tschaub/draw-options

Options to draw interaction are not optional.