Renamed widget.js to hubWidget.js
Added light and dark color scheme.
Moved most HTML into hubWidget.js instead of being in the actual HTML file. This will allow clients to only have to place a little bit of HTML on their pages.
Added light/dark images
Took care of the loading icon in stylesheet instead of JS
Pointed to production API. Removed callback argument in getArticles() method.
Pointed to light theme.