- Make `pydub.AudioSegment()` objects playable inline in ipython notebooks.
- Add scipy powered high pass, low pass, and band pass filters, which can be high order filters (they take `order` as a keyword argument). They are used for `pydub.AudioSegment().high_pass_filter()`, `pydub.AudioSegment().low_pass_filter()`, `pydub.AudioSegment().band_pass_filter()` when the `pydub.scipy_effects` module is imported.
- Fix minor bug in `pydub.silence.detect_silence()`