- Refactor based on discussion on 08.06
- Add test for FFTW transform

- Refactor transform() according to discussions
- Add checks for validity of axes

- Move the transform logic to its own method
- Refactored the _fftw_plan_and_info to FFTWTransformInfo

Seperate keepers and d2o



See merge request !15

Included version.py for __version__ attribute.
Included new nifty_config and d2o_config files.

- Finished the case when input is np.ndarray
- Fix typos

- get_slice_list returns the entire shape when axes is None
- GFFT.transform() is now a single for-loop
- Input array is simply cast to codomain's dtype
- Other formating changes were included/reverted

- GFFT.transform() now returns data cast to codomain's dtype
- Remove cast to codomain from rg_space.calc_transform()

- GFFT now uses get_slice_list to get slices to iterate over all axes

Slice list iterator



See merge request !12

- GFFT now checks if the axes keyword is provided and only applies FFT to those axes.

- Rename FFT classes so that they follow PEP8 naming conventions. The following classes have been renamed:
    - fft -> FFT
    - fft_fftw -> FFTW
    - fft_gfft -> GFFT
- Add docstrings for new arguments and for the old ones missing one
- Add axes keyword to rg_space.calc_transform()
- More PEP8 fixes in nifty_fft
- GFFT's transform method now uses paradict instead of para

- Reformat code according to PEP8
- Add 'axes' keyword to transforms of both FFT machines.