Added notebook in examples explaining the functionality of wigner_tra…#65

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NithinRamu wants to merge 3 commits intoqutip:masterfrom NithinRamu:master

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Commits on Aug 24, 2018

Added notebook in examples explaining the functionality of wigner_transformation and plot_Wigner_sphere in wigner.py and visualization.py respectively.
NithinRamu
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Commits on Mar 4, 2019

minor improvements to the wigner_visualization notebook
NithinRamu
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Commits on Apr 29, 2019

renamed function in line with new qutip commit.
NithinRamu
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