Only shell-out to ruby once in chruby_use.
Only shell-out to ruby once in chruby_use.

ngpestelos/chruby,postmodern/chruby,JeanMertz/chruby-fish,postmodern/chruby,regularfry/chruby,kbrock/chruby,ilikepi/chruby,eunomie/chgo,kbrock/chruby,rstacruz/chruby-fish,ngpestelos/chruby,rstacruz/chruby-fish,eunomie/chgo,regularfry/chruby,ilikepi/chruby,JeanMertz/chruby-fish