Update installation.md
Created by: dearshor
In China, due to complex network problem, we should use a ruby mirror built by Taobao to insure that your installation be successful, I had added this suggestion to this doc.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: dearshor
In China, due to complex network problem, we should use a ruby mirror built by Taobao to insure that your installation be successful, I had added this suggestion to this doc.