Placed the method convert_to_decibels outside AuditorySpectrogram as it's useful elsewhere. Corrected AuditorySpectrogram and OctaveSpectrogramWithAmplification, their frequency ranges were counting backwards. Changed all spectrogram methods to use the new _shape_response method from PowerSpectrum. Fixed OctaveSpectrogramWithAmplification so it actually works, changed its default amplification to 15%.
Placed the method convert_to_decibels outside AuditorySpectrogram as it's useful elsewhere. Corrected AuditorySpectrogram and OctaveSpectrogramWithAmplification, their frequency ranges were counting backwards. Changed all spectrogram methods to use the new _shape_response method from PowerSpectrum. Fixed OctaveSpectrogramWithAmplification so it actually works, changed its default amplification to 15%.

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