Remove cartograms submodule

We’re moving to the assumption that cartograms is installed
globally, rather than being included as a submodule in every
project that uses it.
Fix line endings
Merge branch 'master' of github.com:kiln/carbonmap.org
Flatten directory structure of World Bank CSVs

The directory structure was unsystematic – depending on the order in
which downloaded zip files were decompressed – so it’s better to use
a flat structure.
Rename "2014 data update" to Raw
Fix upload-to-graun script
Merge branch 'master' of github.com:kiln/carbonmap.org
Remove unneeded code