First release of the 0.2 series.
Major changes:
- Now cover audio with shape (n_samples, n_channels) also.
- Test code for utils and WSOLA is now available.
- Now using travis-ci.
- Update requirements.
Minor changes:
- Fix stft.py, pvtsm.py to become more readable.
- Fix bugs in the sin window function.
- Fix bugs while finding peaks for phase-vocoder.