Reproject d3-carto-map three modes including gnomonic

Trying to make a little page to reproject data using d3.carto jam and it kind of works.

This defaults to a gnomonic projection w/ map.mode('globe') which makes for some rotating cool rotation effects when panning the map rather than just transitioning every path like in projection mode.

Then there's the boring old transform mode which I think is just mercator.

Please see d3-cart-map readme.md for a little explanation of the map modes (from which 'globe' is missing). And show me how to use them correctly.

https://github.com/emeeks/d3-carto-map

Things which could make this a little nicer:

-Adding some graticules maybe not to the feature group.

-Adding different kinds of layers.

-Figure out what the errors are about the paths which get multiplied when panning in globe mode.

For some much cleaner better javascript examples of how to do similar things w/ d3 please see Jason Davies stuff like http://www.jasondavies.com/maps/transition/ and Mike Bostocks stuff like /mbostock/3711652.

Really I'm just trying to figure out how to kind of do some things they did w/ d3-carto-map.

As always let me know if there is anything silly in my code or how I could make it better.

<html xmlns="https://www.w3.org/1999/xhtml">
<head>
  <title>reprojection selection</title>
  <meta charset="utf-8" />

</head>

#map {
    height: 90%;
    width: 90%;
    top: 10%;
    position: absolute;
  }

#title {
    padding: 20px;
  }

.bluesquare {
    fill: green;
    stroke: gray;
    stroke-width: 1px;
  }

button.marker {
    position: fixed;
    z-index: 1;
    bottom: 150px;
    left: 150px;
  }

.countryborders{
    fill:#99d8c9;
    stroke:#de2d26;
  }

.reproject{
    margin-top:-15;
  }

.reprojectshp{
  margin-top:-15;
}

.addgr{
  margin-top:-15;
}

#projection-menu{
  margin-top:5px;
}

.grat{

stroke:grey;
  stroke-width:1px;
  stroke-opacity:.7;
  fill:none;

}

</style>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://d3js.org/topojson.v1.min.js to a secure url

Modified http://d3js.org/d3.geo.projection.v0.min.js to a secure url

Updated missing url https://rawgit.com/emeeks/d3-carto-map/master/d3.carto.map.js to https://cdn.jsdelivr.net/gh/emeeks/d3-carto-map/d3.carto.map.js

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v1.min.js

https://d3js.org/d3.geo.projection.v0.min.js

https://rawgit.com/emeeks/d3-carto-map/master/d3.carto.map.js