Updated Gemspec
Updated Gemspec

* Updated gem versions
* Moved metrics gems that work in 1.9 outside of the 1.8 guard clause

XescuGC/virtus,JustMikey/virtus,dslh/virtus,reevoo/virtus,artemeff/virtus,kristianmandrup/virtus,faucct/virtus,nuclearsandwich/virtus,macressler/virtus,baojjeu/virtus,mallikarjunayaddala/virtus,solnic/virtus,hapiben/virtus,lgierth/virtus