ADD: Example json (I know it's in gitignore, but it is linked here: https://github.com/uwdata/lyra/blob/master/src/js/app/vde.js#L22)
Handling cross-site data requests, proxy should check refering URL
Use CURLOPT_RETURNTRANSFER
Pulled examples from signalwerk/example_data

Merge remote-tracking branch 'signalwerk/example_data'