function mgf( t, p ) {
	return addon( t, p );
}
Evaluates the moment-generating function (MGF) for a Bernoulli distribution with success probability `p`.

@private
@param {number} t - input value
@param {Probability} p - success probability
@returns {Probability} evaluated MGF

@example
var y = mgf( 0.2, 0.5 );
// returns ~1.111

@example
var y = mgf( 0.4, 0.5 );
// returns ~1.246

@example
var y = mgf( NaN, 0.0 );
// returns NaN

@example
var y = mgf( 0.0, NaN );
// returns NaN

@example
var y = mgf( -2.0, -1.0 );
// returns 1.8646647167633872

@example
var y = mgf( 0.2, 2.0 );
// returns 1.4428055163203397