Consider trimming reutils JAR size for space (and speed) with ProGuard

[DamonHD]

Mainly I feel a bit icky about committing 600kB to SVN on each update when I'm fairly sure I'm not using most of that for the command-line intensity computation, but trimming may also reduce start-up time and other overheads.

And ProGuard has worked like a champ for me in the past!

https://github.com/Guardsquare/proguard

At least the configuration should be relatively simple if I don't try to be too clever...