Change 'print' statement to make compatible with python3

Small description changes

Added the description of the algorithm as an image

Added better windowing function and which prevents unwanted amplitude modulation

Added the simplest implementation of Paulstretch algorithm.

Renamed "transient" to "onset"

Corrected version

Improved the transient detection algorithm

The time streching is more accurate related to the transients (i.e. it doesn't short the sound on transinets).

Added a new method of extreme stretch with is much faster and which use transients information.

Made output louder

readme

first commit