Removed buffering in rtp client. This simplified things alot e.g. the recv routine has been removed, and therefore anything that was there to help with handling of the routine is also gone
like the Start() and Stop() methods as well as signalling channels and waitgroups. The client is now just effectively a wrapper for a udp conn.
Simplified clien_test.go file by testing two different RTP packet operations using loop. We now first test no operation,
and then test a rtp.Payload operation, which gets the payload of the packets and stores them in the client ringbuffer for the
user of the client to read.
Wrote test TestReceiveNoOP to check that client works correctly when we give no operation to perform on RTP packets before
storing in the client ringBuffer, which calling io.Reader implementation Read will get packets form.
Scott