Create notification contrib package
write Notification module class
create class method `add`, used to create message
later will be changed by the save()
Create sse sever view
Merge branch 'master' of github.com:opps/opps into opps.notification

* 'master' of github.com:opps/opps:
  used travis-ci image on master branch
Fix pep8 on opps contrib notifications views
Update save Notification, save in nosql database
remove class view name
fix typo type to default on Notification class
add save on opps nosql (redis) in opps contrib notification
Create admin notification
generate messagem type (json)
Create APIServer view on notification
used to json render
create url entery to Async server notifications application
create view to long pulling server
return json, add var old_id get > id in query set
create url entry long puling to notification
Create initial migration for notifications on opps contrib
Merge pull request #246 from opps/opps.notification

Opps.contrib.notifications