removing poster feature
Nan Deng <monnand@gmail.com>

Step 9: changing msgcenter pkg
finally, we removed the poster feature.
Nan Deng <monnand@gmail.com>

Removing the poster feature for the following reasons:
1. If the user wants such feature, he can simply setup a web server
supporting static content.
2. If the client wants to be notified when something changed, the server
can simply send a message telling the client about the update.