Fixes #34 (Diff swallows black color in added areas): adds options.ligth...#52

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Commits on Apr 23, 2015

Fixes #34 (Diff swallows black color in added areas): adds options.ligthness, options.rgb and options.stack to customize the diff image.
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Commits on May 14, 2015

Replaces lightness and rgb options with lightboost and diffColor (PR 52#issuecomment-101045835)
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