upped dependencies to PHPUnit 4.0.
Merge pull request #533 from stopfstedt/phpunit-four-nil

upped dependencies to PHPUnit 4.0.
renamed group tag 'user_sync' to 'usersync' b/c phpunit doesn't like it.
Merge pull request #534 from stopfstedt/underscore_be_gone

renamed group tag 'user_sync' to 'usersync' b/c phpunit doesn't like it.