Add file size

[iamvdo]

It could be useful to compare results with the size of compress file. Not that the result size is important, but to compare with minifiers that try to be too smart.

[Deeech]

there is another tool to benchmark minifiers. But i can add this feature if we going to test more minifiers.

[iamvdo]

I knew this tool, but as I said before, the size is not the main criterion. Your benchmark is much more important to compare minifiers I just wanted to add size of result file, because if a minifier reduces a lot but gives many "errors", it's not a good minifier. ;-)