Use assets for css files.
Add News feature, update home page
Add platform group for Gemfile
Update CSS for home page
Update the home page UI: header and title
Update the home page UI: news list style
Update the home page UI: shadow and underline
Update the home page UI: pop-up news in new window
Remove useless routes for news_and_events
Update the backgroup index page for news and events
Merge develop to master