If the requested Ruby is already in use, return (closes #4).
If the requested Ruby is already in use, return (closes #4).

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