Added Renderer#use(fn). Closes #224
Added Renderer#use(fn). Closes #224

cemoulto/stylus,Delapouite/stylus,darwin/stylus,meteor/stylus,behzad88/stylus,trixter5/stylus,rstacruz/stylus,Ricardh522/stylus,Zagorakiss/stylus,johnnycopperstone/stylus,peterkinalex/stylus-1,modulexcite/stylus,Panya/stylus,tyv/stylus,stylus/stylus,isaacs/stylus,SimenB/stylus,a-x-/stylus,yetone/stylus,baotingfang/stylus,jangarcia/stylus,jonpacker/stylus,HossainKhademian/Stylus,angryrobot/stylus,galenvagen/stylus,ThiagoGarciaAlves/stylus,PeterWangPo/stylus,silvaemota/stylus,jameswomack/stylus