Return a dilated region.

        :param iterations: number of iterations to use in dilation
        :returns: :class:`jicimagelib.region.Region`

def dilate(self, iterations=1):
        """Return a dilated region.

        :param iterations: number of iterations to use in dilation
        :returns: :class:`jicimagelib.region.Region`
        """
        dilated_array = nd.morphology.binary_dilation(self.bitmap, 
                                                      iterations=iterations)
        return Region(dilated_array)