Refactor bug fix minor feature requests

This pull request addresses the following issues:

- https://github.com/rafecolton/docker-builder/issues/129 - update `/jobs` to return an array of jobs, sorted by creation date descending
- https://github.com/rafecolton/docker-builder/issues/131- `/jobs/:id` does not include stderr message if job fails during setup
- https://github.com/rafecolton/docker-builder/issues/126 - return the full uri for log_route so it is clickable in the browser (also return `info_route`, which is the route for the individual job)
- https://github.com/rafecolton/docker-builder/issues/130 - add the ability to filter (by multiple filters) `/jobs` by adding a query string parameter

Also:

* adding `tip` to the travis build matrix

/cc @matthewotto @jszwedko