#31: add audio_converter
#31: audio_converter -> audio_converter_rate
#31: ensure we are scanning the correct audio directory
#31: add file-modification flag
#31: specifically scan 'audio/recording' directory
#31: ensure audio_converter_rate has proper permission
Merge pull request #35 from jeff1evesque/force_audio_conversion

#31: Ensure microphone configuration rate is 16kHz, 16bit