unknow file format when loading frame files.

[SlahserZ]

Throwing a error 'unknow file format' when I load frame files from aws s3. I have found this error in xviz-file-loader

      var fileFormat = filePath.toLowerCase().match(/[^\.]*$/)[0];

if I use this RegExp to match a s3 url and get a string like 'json?a=1&b=2.....' I think it's a bug for streetscape.gl. I will fix it right now.