Backburner Specific Admin Panel Prototype (Issue #11 )

I finally got around to taking a stab at a Backburner Admin interface.

This is just a prototype and needs a lot of cleanup, but let me know what you think.

The final dashboard would have some sort of data visualization for each job queue (Bar chart with the different tube states? Historical Line Chart with counts over time) and the page data would update dynamically over AJAX similar to the Sidekiq monitoring interace.

We can also add more administrative actions like removing Jobs, clearing queues, etc.

Most of the code is isolated in the web directory. There's a README in there on how to build the Javascript/CSS. Otherwise it's just a Sinatra app in the lib folder.
(Also, no tests as of yet...)

![dashboard](https://f.cloud.github.com/assets/1254604/432252/412a6de0-ae9f-11e2-8f83-bb762df59484.png)

![configuration](https://f.cloud.github.com/assets/1254604/432253/49d174e8-ae9f-11e2-992e-8e79d8e7582c.png)

![job_queue](https://f.cloud.github.com/assets/1254604/432254/4c1e3b96-ae9f-11e2-817a-c339e471dbbb.png)