Project watchers watch all issues and postings
Update watch doc
Fixed broken test
Send Notifcation for new posting.

Remove duplicated code with the notifcation for new comment.
Send notification for new issue.

Remove duplicated code with the notifcation for new posting.
Send notification for updating issue.
Send notification for mass-update.
Send notification to mentioned users.

For users mentioned in new issue, new comment and new posting.
Introduce scheduled notification by Akka.
Apply scheduled notification for new issue.
Apply scheduled notification for new posting
Apply scheduled notification for changing assignee.
Apply scheduled notification for changing state.
Show notifications on the Site Main.
Add some javadoc for notification.
user: Fix FK error about assignee while deleting a user.

While deleting user, also delete assignee.
fix #344 - add repository renaming
config: Fix NPE if application.secret is not set.
test: Remove unused test/support.
fix #345 - css overflow hidden