Fixes, faster now using telemtry-js-node

So I wrote a node.js module to download `telemetry.js` from `telemetry.mozilla.org/v1/telemetry.js` and initialize it... Note that this is not very secure... as we load code over HTTP... So should run some where not too critical :)
See [mozilla/telemtry-js-node](https://github.com/mozilla/telemetry-js-node) for details.

I also fixed some scoping issues, missing `var`... And set it to download 3 files in parallel... That was enough to max out my CPU... I guess the JSON parsing, construction and stringify is the expensive operations.

**Please**, make sure to test this... I only tested the exporter... and didn't run to end, coz I was lazy :)