[docs] document phar-stub bug in pitfalls
[docs] document phar-stub bug in pitfalls

- https://gist.github.com/916005
- http://silex-ru.net/discussion/10/fatal-error-class-silexapplication-not-found

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