Fix parsing in node and sandbox link

The fix for #77 (3ccfced168f5880b56ed364010fb8df5fcf1e582) incompletely removed a workaround for a now-fixed bug in jsdom*, causing all camelCase keys to parse incorrectly from node. This commit removes the stray lines which were casting all keys to lowercase in node.

It also updates the link to the sandbox again, because the current link 404s.

*There were two separate places where the workaround happened but the existing commit only removed one of the two