WIP improve dehub navigation bar (bug 750904)

https://bugzilla.mozilla.org/show_bug.cgi?id=750904

What that does:

- change the red title (h2) to display add-on name
- modify navigation panel to only bold current link
- create the new "status box" at the top
    - add version information (current/latest version, position in the review queue)
    - add tooltip on status
    - add specific information when a version is being reviewed/rejected