REFACTOR - extracted has-server? function
REFACTOR - renamed task-id to more appropriate job-id
REFACTOR - task->job and formatting
Extended internals to track reservation times.
Added support for expiring reservations to beanstalk mockup
factored out tube iteration code into update-tubes function
Added support for the touch command to the beanstalk mock up.
added support for TTR
Opened up the job and reservation code in the beanstalk mock up.
Added unit tests for work-queue/touch.
added support for beanstalk release