Log more information about jobs being run

I found it very difficult to track what the workers were doing without using delayed_job_web and/or keeping completed jobs around. This adds some more actionable information to the job  logging output, and cleans it up a bit.

![36505523](https://f.cloud.github.com/assets/451345/292350/e04a857e-9322-11e2-9439-b811df297657.jpg)