upgrade core files

Signed-off-by: ShiningRay <shiningray.nirvana@gmail.com>
upgrade routes.rb upgrade awesome_nested_set remove unused plugins

Signed-off-by: ShiningRay <shiningray.nirvana@gmail.com>
change `named_scope` to `scope`

Signed-off-by: ShiningRay <shiningray.nirvana@gmail.com>
New mailer method
upgrade UserNotifier#signup_notification

Signed-off-by: ShiningRay <shiningray.nirvana@gmail.com>
fix role requirement
bring up server

Signed-off-by: ShiningRay <shiningray.nirvana@gmail.com>