UI
main navigation
Merge branch 'master' of https://github.com/Raysmond/FDUGroup

Conflicts:
	public/css/theme.css
top search bar
UI
Merge branch 'master' of https://github.com/Raysmond/FDUGroup
search bar
arrow
UI
UI
css update
post view, group detail
UI
UI
UI
UI
ui optimization
ui optimization
UI
Merge branch 'master' of https://github.com/Raysmond/FDUGroup