Added basic script for combining JSON datasets

Currently very inflexible, only supports datasets in a folder named
after the dataset, with the data split into files named after the areas.

combiner.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env sh
+
+mkdir -p combined-datasets
+for area in $(find processed-datasets/ -type f -printf '%f\n' | sort -u); do
+    (
+        echo '{'
+        first=1
+        for dataset in $(find processed-datasets/ -name "$area"); do
+            if [[ $first -eq 1 ]]; then
+                first=0
+            else
+                echo ","
+            fi
+            echo -n '"'$(basename $(dirname $dataset))'":'
+            cat $dataset
+        done
+        echo
+        echo '}'
+    ) > combined-datasets/$area
+done