function parse( out, str ) {
	var slides;
	var i;

	slides = str.split( SLIDE_SEP );
	for ( i = 0; i < slides.length; i++ ) {
		out.push( parseSlide( slides[ i ] ) );
	}
	return out;
}
Parses a string into presentation slides.

@private
@param {Array} out - output array
@param {string} str - string to parse
@returns {ObjectArray} output array