added a tip about debugging caching problems (closes #135)
added a tip about debugging caching problems (closes #135)

peterkokot/Silex,stof/Silex,peterkokot/Silex,SpacePossum/Silex,plotek/Silex,romainneutron/Silex,stof/Silex,Incognito/silex-fork,cesarmarinhorj/Silex,cgsmith/Silex,arduanov/Silex,CarsonF/Silex,tcx1000/Silex,arduanov/Silex,lokhman/Silex,mTorres/Silex,naderman/Silex,mTorres/Silex,lyrixx/Silex,CarsonF/Silex,fhinkel/Silex,beealone/Silex,naderman/Silex,jdreesen/Silex,tcx1000/Silex,mathroc/Silex,stof/Silex,JPry/Silex,jdreesen/Silex,peterkokot/Silex,GromNaN/Silex,lyrixx/Silex,mathroc/Silex,Tobion/Silex,Tobion/Silex,mmauri04/Silex,akucherevskiy/developex_test,cesarmarinhorj/Silex,gencer/Silex,SpacePossum/Silex,JPry/Silex,Tobion/Silex,lokhman/Silex,romainneutron/Silex,akucherevskiy/developex_test,RayRutjes/Silex,akucherevskiy/developex_test,beealone/Silex,SanderKnape/Silex,lyrixx/Silex,Incognito/silex-fork,GromNaN/Silex,Xephi/Silex,RayRutjes/Silex,GromNaN/Silex,silexphp/Silex,naderman/Silex,fabpot/Silex,SanderKnape/Silex,Xephi/Silex,fhinkel/Silex,mmauri04/Silex,plotek/Silex,fabpot/Silex,romainneutron/Silex,CarsonF/Silex,cgsmith/Silex