Use assets for css files.
update the index introducion of ShineScrum
Make the description of Shinescrum a litte smaller
Add more info to index page
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
Merge branch 'master' of github.com:gazeldx/scrum into feature_i18n

Conflicts:
	app/assets/stylesheets/style.css.scss
	app/views/home/index.html.slim
	app/views/layouts/application.html.erb
	app/views/shared/admin/_navigation.html.slim
	config/locales/zh.yml
	config/routes.rb
	db/schema.rb