function encodeResult( result ) {
	var out = YAML_BEGIN;
	out += YAML_INDENT + 'iterations: '+result.iterations+'\n';
	out += YAML_INDENT + 'elapsed: '+result.elapsed+'\n';
	out += YAML_INDENT + 'rate: '+result.rate+'\n';
	out += YAML_END;
	return out;
}
Encodes a result as a YAML block.

@private
@param {Object} result - result
@returns {string} encoded result