Merge left column into jobs table, widen the table

This makes the jobs table wider than before and moves the content of the left column to the top of the jobs table. There are no new columns yet, but this makes space for a last-runtime column.

![Chronos converted to 2-column layout](https://f.cloud.github.com/assets/29612/1720261/cf790eb0-61fc-11e3-946d-c74eba5564ed.png)

This also hides several settings behind an "Other settings" link the job details item in the right column. That section includes settings that should infrequently be changed since the defaults will work for most use cases.

This is the same contents as https://github.com/mesosphere/chronos/pull/4