This adds d3.geo.transverseMercator and removes the custom default scales from
the mercator and equirectangular projections. Also, this commit removes the
built-in 2π scale factor from the mercator projection, simplifying the
implementation and making it consistent with transverseMercator and GDAL. This
is a partial fix for #1133; see also d3/d3-plugins#55.
Rather than producing separate files for each module, the default build now
produces a single file. This should encourage better page-load performance as
the files were relatively small. Also, it's easier to deal with only one file
rather than many, especially if you're not quite sure what the dependencies are.
You may still create minimized builds, if you don't want every feature.
This commit also demotes the chart components to the examples directory, rather
than keeping them as part of the core library. As always, D3 is not a charting
library, and these were ever only intended to serve as examples.
Mike Bostock
Jason Davies