Just released ruby-config 0.7. Most inte...

Just released ruby-config 0.7. Most interestingly I changed the user interface to be command based instead of using option switches. So, instead of:ruby-config --list-installed you can do a simple:ruby-config listIn case you missed the 0.6 release. Most noteworthy I fixed the chicken-egg problem where a newly installed Ruby runtime doesn't have the ruby-config gem installed yet. I've started maintaining Release Notes to make it more convenient to follow changes in the future.