Updgraded to latest version of Spring Security Oauth2

Updgraded to latest versions of

- Spring (3.1.3)
- Spring Security (3.1.3)
- Spring Security OAuth2 (1.0.5)
- Selenium (2.33.0)

Also changed T2 integration tests to use FireFox instead of HtmlUnit,
because the latter was having problems with UserVoice script.