Adding support for the audio analysers.

Add their definition to the test configuration file. Test knows when to expect an audio signal and what frequency it should be depending on the talker/listener that are being connected. Ensures there are no audio glitches.
Tidy of quotes and dead code.
Fix the expected results for stream forwarding when listener already connected.
Merge pull request #3 from pthedinger/master

Adding support for audio analysers to test.