Moved tab navigation to top navbar

A nav is a nav.  It doesn't matter where it is.  By moving the
data-toggle command `tab` to the navbar anchors, when clicked, they look
to toggle the `active` status of any tab-pane's with the correct id
Give users the option to change viewport

This helps illustrate a key way in which the viewport changes the way
the page renders.

This will have no affect on a desktop browsers because they ignore the
viewport meta tag.
Instead, to see the full effect, use the AMAZING chrome emulator:
https://developer.chrome.com/devtools/docs/mobile-emulation
https://www.youtube.com/watch?v=z7sTRdSpA04
Added Customize Info

Changed Active Tab to Customization

Added some info about customization.
The following links are particularly helpful:
http://getbootstrap.com/customize/
http://bootswatch.com/
http://www.bootstrapcdn.com/