Issue #5570: Use new manifest url to resolve conflict
Feature #4977: Implement two level of progression in AssetsManager
Feature #4977: Bug fixes for download resuming
Feature #4977: Improve log informations and event messages
Feature #4977: [AssetsManager] Implement server resuming support check
Merge pull request #55 from pandamicro/lua-vm-3.1.1

Implement two level of progression, server resuming support check, improve messages