Updated through http://www.deanoj.co.uk/programming/git/git-ignore-file-for-symfony2/

Symfony2.gitignore

+# Bootstrap
 app/bootstrap*
+
+# Symfony directories
+vendor/*
 */logs/*
 */cache/*
 web/uploads/*
 web/bundles/*
-vendor/
-app/config/parameters.ini
+
+# Configuration files
\ No newline at end of file
+app/config/parameters.ini