SqueakCI-Benchmarking

Hi Frank,

So this is my initial work on getting SqueakCI up and benchmarking.  The builtastic.sh file now contains an extra line, launching the vm with my benchmarks.st file after the tests have been run.

The benchmarks.st file grabs Nicolas Cellier's code from SS3, along with one of my repositories that has extension methods for outputting the results of his benchmarks.

I figure that once this has been merged and shown to run ok for a few runs I will alter the configuration in SqueakCI to pickup the output files.  After that I'll send another pull request with changes for the other platforms as well.  But for now I just want to get this in and make sure nothing else blows up.

Please let me know if you want any changes made or if you have any feedback.
Thanks,
Jeff