Add scipy-powered filters and bump version

increment version for bugfix release

Increment version for 24-bit wav bug fix

increment version for 24bit wave support

PR followup

Added tests, incremented version, and added the author of the PR to the AUTHORS file

updates for next release

Add authors from pull requests, increment version and update docs

test sample values against known data

was previously testing against decoded mp3 data which can change slightly due to different mp3 codecs

busted indentation

Merge branch 'master' of https://github.com/jiaaro/pydub

increment version with bugfix