Save results to an external file

[XhmikosR]

I think we should improve the data generation and not generate the index.html file directly.

A few ideas for implementation:

1. Use XHR and load the bench data
2. Inline the data via Jekyll includes; maybe in an array or something

Either way, this should allow us to do more on the frontend part, add a GitHub ribbon maybe, add more info about the system the bench last run, add the gzip bench too and so on.