v2.4.4

1. Fix a potential memory leak.
2. Fix some compiler related issues.

v2.4.3

Minor bug fixes.

v2.4.2

Refine memory management.

v2.4.1

Fix a security bug.

v2.4.0

Refine the one-time authentication.

v2.3.3

Minor bug fixes.

v2.3.2

Minor bug fixes.

v2.3.1

• Fix an issue of connection cache of UDP relay.
• Add support of one time authentication for header verification.

v2.3.0

• Add manager mode to support multi-user and traffic stat.
• Fix a build issue on OS X El Capitan.

v2.2.3

Fix some issues for multi-destination UDP relay.