code: public CdnPathBuilder scaleCropCenter(int width, int height) {
          dimensionsGuard(width, height);
          sb.append("/-/scale_crop/")
                  .append(width)
                  .append("x")
                  .append(height)
                  .append("/center");
          return this;
      }
docs: Scales the image until one of the dimensions fits,
  centers it, then crops the rest.
  
  @param width New width
  @param height New height