More fixes & features

New fixes in nginx-rtmp:

• Aggregated RTMP message support. These are plain FLVs inside RTMP stream. FMS publishes that kind of data  in certain cases.


• Fixed auto-generated tcUrl in relay module in case full RTMP url is specified in pull directive. The tcUrl is sometimes verified by server.


• Implemented skipping empty H264/AAC headers.


• Fixed RTMP acknowledge messages. This bug could result in stream disconnect when publishing from FMS.

All the fixes are implemented in aggregate branch.