improve dehub navigation bar (bug 750904)

[magopian]

(moved from zamboni/pull/1752)

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

[vinyll]

Any reason to change id="enable-addon" to class="enable-addon"?

[magopian]

There's now sometimes several links on the same page to do the same thing. As we can't have multiple times the same id, I opted to use classes (and modified the javascript that hijacks the link clicks to display the pop-ins).

[diox]

@cvan is this good to go now?

[magopian]

@kmaglione it seems you're really comfortable with the different statuses and the review flow for addons, would you mind giving a review on this PR? Thanks!