remove the unhelpful stack trace setup, using gdb on server for now
Merge pull request #258 from birarda/stacktraces

remove the current un-helpful stacktrace setup
initialize the _shouldLoopbackForAgent variable
Merge pull request #259 from birarda/mixer-crash

fix the audio-mixer crash for uninitialized _shouldLoopbackForAgent variable
make sure that the AudioRingBuffer exists before trying to use it
Merge pull request #260 from birarda/mixer-crash

more fixes for audio mixer crashing: