Fixed JavaDoc in UserRepository.
Dependency upgrades.

Spring 3.2.2 -> 3.2.3
Hibernate 4.1.9 -> 4.2.2
Slf4j 1.7.1 -> 1.7.5
Log4j 1.2.16 -> 1.2.17
Joda Time 2.1 -> 2.2
Hamcrest 1.1 -> 1.3
Spring Data JPA 1.3.1 -> 1.4 M1

Maven compiler plugin 2.5.1 -> 3.1