Add Greeninfo logo

[danrademacher]

All that hubbub about Mapbox and we forgot to include our own logo (as we specify in our own terms...)

Here's a mock:

And 1x and 2x PNGs: GINlogos.zip

Those should match the height of the scalebar, and link to greeninfo.org.

I tested different zooms and that's the longest I could get the scalebar to be, with 45px left-margin, and it seems like it will avoid crashing into anything.

[nilesbarnes]

Thanks @danrademacher for the heads up! We will also give a shout out and include a link in the blog post we publish Thursday thanking GreenInfo.

[clhenrick]

Thanks @nilesbarnes!