Added 2D Fourier transformation as num.fft2 and num.fft2_inv.#22

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h4rm wants to merge 2 commits intofranko:masterfrom

Commits on Feb 5, 2014

Added 2D Fourier transformation as num.fft2 and num.fft2_inv.
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Commits on Feb 6, 2014

Revert "Added 2D Fourier transformation as num.fft2 and num.fft2_inv."
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