CS fix for InvalidQueueException
Fix check for beanstalkd tube
Remove tests for Releaseasable and Buryable

The release and bury exceptions are removed so these tests do not make sense (and fail).
Delete BuryableJob.php
Delete ReleasableJob.php
Merge pull request #21 from juriansluiman/hotfix/php-unit-failing

Hotfix/php unit failing