public void setPicasso(Picasso picasso) {
        mPicasso = picasso;
    }
Provide a Picasso instance to use when loading pictures, this is useful if you have a
particular HTTP cache you would like to share.

@param picasso The Picasso instance to use, may be null to let the system use the default
               instance
library/src/main/java/com/daimajia/slider/library/SliderTypes/BaseSliderView.java