Updated example for new Handler trait
Updated example for new Handler trait

This introduces a bit of complexity to the example,
mainly the use of the try_continue! macro for dealing
with errors, but I think this is an appropriate trade-off
as users of this library are likely to be framework authors
instead of end users.

erickt/hyper,nickgonzales/hyper,huonw/hyper,markuskobler/hyper,Manishearth/hyper,manuel-woelker/hyper,mitsuhiko/hyper,frewsxcv/hyper,jmmaranan/hyper,reem/hyper,hyperium/hyper,tshepang/hyper,softprops/hyper,Twey/hyper,nstoddard/hyper,hyperium/hyper,retep998/hyper,hyperium/hyper,ianks/hyper,Keats/hyper,lame-nickname/hyper,tshepang/hyper,Twey/hyper,servo/hyper,PeterReid/hyper,golddranks/hyper,tshepang/hyper,pyfisch/hyper,giftcards/hyper,achanda/hyper,peterhj/hyper,nickgonzales/hyper,Keats/hyper,fuchsnj/hyper,mre/hyper,markuskobler/hyper,hannobraun/hyper,golddranks/hyper,Ryman/hyper,markuskobler/hyper,bheesham/hyper,mikedilger/hyper,yangxingpping/hyper,mfeckie/hyper,yazaddaruvala/hyper,hannobraun/hyper,clatour/hyper,mlalic/hyper,golddranks/hyper,TimNN/hyper,pcwalton/hyper,hannobraun/hyper,nstoddard/hyper,Keats/hyper,fhahn/hyper,Twey/hyper,mlalic/hyper,youprofit/hyper,mneumann/hyper,bonifaido/hyper,sfackler/hyper,yazaddaruvala/hyper,steveklabnik/hyper,rschulman/hyper,tempbottle/hyper,nickgonzales/hyper,fengsp/hyper