Update version to a pre-release one

Now we can more easily determine what's on the devel server.
New: Small ELVIS swoosh logo for (upcoming) new theme
Remove unused Bootstrap 2.2.2 files
Upgrade jQuery (1.8.2 ==> 1.8.3.min)

Ideally we'll be much upgraded, but this is a small improvement.
Upgrade knockout.js (2.3 ==> 3.1)
Upgrade underscore.js (1.5.1 ==> 1.6)
Upgrade Fuel UX (??? ==> 2.6.1)
Update base.html template for the preceding JS/CSS upgrades
Update jquery.datatables.tabletools (on the way to updating datatables itself)
Formatting: Added some spaces to index.html
Switched to versioned JS/CSS DataTables files

It mostly works the same-ish.
Fixed: Minified a bunch of previously-maxified CSS/JS libraries (DataTables.TableTools)
Update the version number for the devel server