Update dependencies to fix open vulnerabilities.

Open vulnerabilities (via Gemnasium):

ALERTS FOR ACTIONPACK (REQUIRED BY FACTORY_GIRL_RAILS, JQUERY-RAILS, RSPEC-RAILS)
- CVE-2013-4491 - REFLECTIVE XSS VULNERABILITY
- CVE-2013-6417 - INCOMPLETE FIX TO CVE-2013-0155 (UNSAFE QUERY GENERATION RISK)
- CVE-2013-6415 - XSS VULNERABILITY IN NUMBER_TO_CURRENCY

ALERTS FOR I18N (REQUIRED BY ACTIVESUPPORT)
- CVE-2013-4492 - REFLECTIVE XSS VULNERABILITY
Merge pull request #40 from JanDintel/fix-vulnerabilities

Update dependencies to fix open vulnerabilities.