Adding option to use a specific queue for ts submitted jobs

Apart from the ability to set priorities for "delayed delta jobs".  I also needed to set a specific queue these "delayed delta jobs" fall under. So that on this queue I can run dedicated workers. 

ts-delayed-delta did not have support for setting specific options which are there in Job.enqueue method of collectiveidea/delayed_job. I have added a hash map so that we can do a lot more with it so that in the future, we can add more attributes apart from queue.

Also, I have removed the code, which will actually provide a fall back  for 2.0.x DJ's to set the priorities.