function prngEnvVars( obj ) {
	var base;
	var min;
	var max;
	var p;

	p = obj.prng.split( '/' );
	base = p[ p.length-1 ];
	min = obj.parameters[ 0 ];
	max = obj.parameters[ 1 ];
	if ( base === 'uniform' ) {
		if ( isInteger( min ) ) {
			min = min.toString() + '.0';
		}
		if ( isInteger( max ) ) {
			max = max.toString() + '.0';
		}
	} else {
		min = min.toString();
		max = max.toString();
	}
	return [
		'BASE_PRNG=\'' + base + '\'',
		'RAND_MIN=' + min,
		'RAND_MAX=' + max
	].join( ' ' );
}
Returns a string containing environment variable for generating pseudorandom numbers.

@private
@param {Object} obj - configuration object
@returns {string} environment variable string

@example
var o = {
    'prng': 'random/base/uniform',
    'parameters': [ -10, 10 ]
};

var s = prngEnvVars( o );
// returns 'BASE_PRNG=\'uniform\',RAND_MIN=-10,RAND_MAX=10'