f.navbar

The branch f.navbar should be pulled in, and it fixes a lot of problems that we have been having.
- [x] Color the navbar rgba(255, 255, 255, .8) so there's a bit of translucensy 
- [x] Stop the top bar from expanding downwards (Closes #108)
- [x] Fix the issue with +/- zoom buttons (Closes #142)
- [x] Add a searching element to the new navbar (Ref #107)
- [x] Add support for Potential node layers (Ref #131)

This pull request does not, however, create full support for potential nodes, or implement searching. Those are all to come in the near future, but not yet.