Version 0.2.0

This release finally implements the missing functions scipy.fft.fht, scipy.fft.ifht and scipy.fft.fhtoffset. The scipy_like and numpy_like functions have also been updated to more closely mimic the interface of SciPy and NumPy. Notably, Rocket-FFT has adopted SciPy's and NumPy's approaches in handling the "axes" parameter in fft2, ifft2, fftn, and ifftn. Further, existing tests have been extended and new tests have been added.