Release 1.3.2 mostly bug fixes, backward compatible

This release is mainly a bunch of bug fixes.
Added a new behavior to chronaural in the form of an extreme dirac approximation.
Changed the way that chronaural calculates the beat so that it is more accurate and works properly for lower beat rates.
Modify noise and bell to always start at zero volume.
Make the fade out for noise and chronaural always be 1 millisecond regardless of frame rate.