pom.xml: updated Selenium to 2.30.0

@see http://code.google.com/p/selenium/source/browse/java/CHANGELOG

No functional changes.
UsersActivationDao: fixed type of primary key.

Should be in c75f89a0266e92d099f4ece5cb59a13febcd4a99 commit.
UsersActivationDao: replaced findByActivationKey() with findOne().

No functional changes.
pom.xml: updated Hibernate to 4.1.10

@see http://in.relation.to/Bloggers/HibernateORM4110FinalReleased

No functional changes.
{Country,Series}ServiceMethodSecurityTest: removed.

Removed integration tests whose primary goal was testing is @PreAuthorize are
applied or not. These tests are not so useful but need time to create them and
I don't see any reason to continue write (and maintain) them in future.

No functional changes.