Implement a new build view

Orginal comment: https://gitlab.com/gitlab-org/gitlab-ce/issues/2932#note_2647887

Here's what I see as the intentional changes:

1. Improve job bar (color icons, upcasing, pipe separator)
2. Improve status and build meta info (combine into single line, under job bar)
3. Improve pull commit message to section above output (instead of sidebar)
4. Remove redundant meta info from sidebar (build # and other builds)
5. Improve colors of job output
6. Overall color/layout around the borders