Remove binary from repo

Since Composer 1.2, binaries are re-installed from vendors if there aren't found.
This avoid us to commit binaries vendors into the repo.

⚠️ You have to update your Composer to the 1.2 (`composer selfupdate`)

.gitignore

@@ -10,6 +10,9 @@
 /var/sessions/*
 !var/sessions/.gitkeep
 !var/SymfonyRequirements.php
+/bin/*
+!/bin/console
+!/bin/symfony_requirements
 
 # Parameters
 /app/config/parameters.yml