use constants for url generator
use constants for url generator

available since symfony 2.3 which is also the requirement of silex master
mTorres/Silex,SpacePossum/Silex,mathroc/Silex,mathroc/Silex,jdreesen/Silex,akucherevskiy/developex_test,CarsonF/Silex,SanderKnape/Silex,cgsmith/Silex,romainneutron/Silex,fabpot/Silex,cgsmith/Silex,peterkokot/Silex,GromNaN/Silex,Xephi/Silex,SanderKnape/Silex,romainneutron/Silex,naderman/Silex,Incognito/silex-fork,naderman/Silex,Xephi/Silex,tcx1000/Silex,fhinkel/Silex,akucherevskiy/developex_test,RayRutjes/Silex,GromNaN/Silex,plotek/Silex,CarsonF/Silex,gencer/Silex,mTorres/Silex,Incognito/silex-fork,JPry/Silex,akucherevskiy/developex_test,plotek/Silex,silexphp/Silex,fhinkel/Silex,peterkokot/Silex,peterkokot/Silex,fabpot/Silex,mmauri04/Silex,beealone/Silex,beealone/Silex,mmauri04/Silex,SpacePossum/Silex,lokhman/Silex,JPry/Silex,RayRutjes/Silex,CarsonF/Silex,tcx1000/Silex,jdreesen/Silex,cesarmarinhorj/Silex,lokhman/Silex,GromNaN/Silex,cesarmarinhorj/Silex,romainneutron/Silex,arduanov/Silex,naderman/Silex,arduanov/Silex