--uncompressed-only option for fair comparisson when output is single JS

[eyaler]

Thanks for your awesome and inspiring work! I am working on a somewhat similar effort (https://github.com/eyaler/ztml) and wanted to compare compression performance with roadroller. I ran some initial benchmarks which you can see in the readme, however, my use case is the one where everything has to be in a JS single file (no following gzip), which is not fair for roadroller. I found the commented out --uncompressed-only... not sure if this is something you are planning to implement, or otherwise do you have any suggestions on how to change your code for this goal.