Merge pull request #2278 from pjackson28/v3.0

Fixed illegal character in slider.js
Merge pull request #2283 from pjackson28/v3.0

Fixed Twitter feed so displays properly
Updated modified dates of footnotes working example pages.
Merge pull request #2291 from EricDunsworth/v3.0-footnotes-symbol

Updated modified dates of footnotes working example pages.
Re-enabled the Twitter Embedded Timeline now that Twitter has fixed the contrat issues.