- comment out a print
- add sample sysconfig
- only do the File jar caching patch in JRuby
- don't emit gem list
- set GEM_HOME and GEM_PATH so gembag installs to the right place
  (for proper MRI/rbx support)
- only give notice about plugin status once per plugin
  Verified by running the test suite and not having a sea of
  "experimental plugin" warnings for the same thing repeatedly.
- make the end of the log profiler more obvious (style)