Use the queue serialization from SlmQueue

Instead of using the job's serialization and providing your own
deserialization, use the queue for both parts.
Update to SlmQueue v0.4 series
Make sure to load dev version of SlmQueue
Update Worker to deal with events
Remove obsolete test, taken into account by SlmQueue
Update count jobs with new event system
Update to Pheanstalk v3.0

Use the namespaces of pda/pheanstalkd instead of PEAR standards
Remove min-stability with SlmQueue v0.4 tagged
s/id/__id__ for metadata

Fixes #41
Cleanup namespace imports
Remove Version.php class
Merge pull request #40 from juriansluiman/feature/v0.4-update

Feature/v0.4 update