Added new minPower parameter to reduce recorded 'silence' or 'near silence'. Now calculating an averageModel and using the averageModel as the default for calculating the top hypotheses.
Added new minPower parameter to reduce recorded 'silence' or 'near silence'. Now calculating an averageModel and using the averageModel as the default for calculating the top hypotheses.

dreamdom/JsSpeechRecognizer,dreamdom/JsSpeechRecognizer