a bunch of fixes in python tests, new audio files under Public Domain
adapt documentation style for Essentia's web, include the style into the code
small fix in readme
fixed segfault in 'weichai' method for the Key algorithm
fixes in python tests fro key and pitchfft, fixed Nan values in PitchYinFFT
more fixes in python tests, updated tests for onsetdetection
Merge branch 'master' of https://github.com/MTG/essentia