Formatted (pretty-printed) the demo .json data to make them more human readable

[sente]

All I changed was the formatting of the demo .json data.

I did so by simply running this bash loop within demos/atlas/maps/ and demos/halfviz/library/ directories:

for i in *.json;
do
    echo $i;
    json-tool $i > $i.new;
    mv $i.new $i;
done