update jquery to 1.8.3
update plugins.js to match bootstrap 4.0.2
update to underscore.js to 1.4.3
update to README to reflect new updates
small typos
Merge pull request #5 from domtancredi/master

Update to jQuery 1.8.3 / plugins.js to bootstrap 4.0.2 / underscore.js to 1.4.3