Binded SVD in the python level and documented

Merged Tiago de Freitas Pereira requested to merge 8-bind-svd into master

Implemented the signal standarization. The signs of U and V is defined analysing the first element of U. If U[0, 0] < 0 then U=-1U and V=-1V With that we have a consistent SVD binds along different implementations (

Closes #8 (closed)

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