Updated framework-bundle lock version.

* Using ~2.4, >=2.4.8 to avoid security issue CVE-2014-4931
* @see http://symfony.com/blog/security-releases-cve-2014-4931-symfony-2-3-18-2-4-8-and-2-5-2-released
Merge pull request #185 from elcodi/feature/udpate-framework-bundle-security-issue

Updated framework-bundle lock version.