UDT v4.8 Release!

UDT: UDP-based Data Transfer (http://udt.sf.net)

UDT 4.8 added epoll support and significantly improves the scalability on concurrent connections.

More updates:
fix a bug that may cause seg fault on concurrent close on the same socket
add epoll support
increase the listener's scalability to 100K concurrent connections
fix a bug that may cause accept/select to return positively when an accepted socket is closed immediately after accept returns
fix a bug that may cause connect to fail if the server closes listening socket immediately after accept returns
fix recvfile fstream write status bug (e.g., when disk is full, recvfile should handle properly now)