merged branch igorw/composer (PR #267)
merged branch igorw/composer (PR #267)

Commits
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9516a00 Revert composer.json to use 2.1 versions again instead of `dev-master`.

Discussion
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Revert composer.json to use 2.1 versions again instead of `dev-master`

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