Feature/alpha beta gamma #60
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This pull request adds the functionality to specify the alpha, beta, and gamma parameters to tailor the luminance, contrast, and structural elements of the SSIM computation. With alpha=beta=gamma, the computation should be equivalent to the original implementation.
The formulate is implemented as described here: https://en.wikipedia.org/wiki/Structural_similarity_index_measure#General_formula_and_components
I have tested the code personally, but I have not run the included tests due to issues downloading the files. Additional work should be done to ensure the tests pass.