Leading "-" in ARGV #18

Possible gotcha when Turn uses "ruby -Ilib bin/turn -" both in the tests and in the isolated test runners. I just discovered that the "-" doesn't get removed but is passed along as the first argument to the command --at least that's what is happening to me on another project, so I assume it will be happening to turn too. If it is, turn seems to me handling it gracefully at this point, but just in case it might be a good idea to shift off any leading "-" in ARGV right off the bat.