Adding image rounding with Picasso Transformation

[travijuu]

Many different image transformations can be added by creating new Transformations. I just added Rounding transformation.

Ex. this code adds margin and radius to the image.

textSliderView
        .setTransformation(new RoundedTransformation(10, 25))
        .description(name)
        .image(file_maps.get(name))
        .setScaleType(BaseSliderView.ScaleType.Fit)
        .setOnSliderClickListener(this);