Wake word audio notification

@aramsichord , I have a similar complaint and as such have made the change in main.py to play a wav file of a beep when it begins recording for the STT engine.

/usr/local/lib/python2.7/site-packages/mycroft_core-1484348707-py2.7.egg/mycroft/client/speech/main.py

added this import line:

from mycroft.util import play_wav

and this line in function handle_record_begin():

play_wav("/home/pi/beep-3.wav")

works great.

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