function addAsterisks( str ) {
	str = '* '+str;
	str = replace( str, /\n(?!$)/g, '\n* ' );
	str = replace( str, /\s*\n/g, '\n' );
	return str;
}
Adds asterisks to the beginning of each line of a string.

@private
@param {string} str - input string
@returns {string} string padded with asterisks at the beginning of each line