added a script to update git submodules

update_vendors.sh

+#!/bin/sh
+
+COMPONENTS='BrowserKit CssSelector EventDispatcher HttpFoundation Process ClassLoader DomCrawler Finder HttpKernel Routing'
+
+cd vendor/Symfony/Component
+for COMPONENT in $COMPONENTS
+do
+    cd $COMPONENT && git fetch origin && git reset --hard origin/2.0 && cd ..
+done
+cd ../../..
+
+cd vendor/doctrine-common
+git fetch origin && git reset --hard origin/2.1.x
+cd ../..
+
+cd vendor/doctrine-dbal
+git fetch origin && git reset --hard origin/2.1.x
+cd ../..
+
+cd vendor/monolog
+git fetch origin && git reset --hard 1.0.1
+cd ../..
+
+cd vendor/pimple
+git fetch origin && git reset --hard origin/master
+cd ../..
+
+cd vendor/twig
+git fetch origin && git reset --hard v1.3.0
+cd ../..