WordPress version control for wp-config. Create a local config file, and then a dev config file on each server and you are set!

WP Config Version Control Setup

if ( file_exists( dirname( __FILE__ ) . '/wp-local-config.php' ) ) {
    include( dirname( __FILE__ ) . '/wp-local-config.php' );
    define( 'WP_LOCAL_DEV', true ); //You can use this to further enable/disable things
}else if( file_exists( dirname( __FILE__ ) . '/wp-dev-config.php' ) ){
    include( dirname( __FILE__ ) . '/wp-dev-config.php' );
    define( 'WP_REMOTE_DEV', true ); //You can use this to further enable/disable things
}else{
	define('DB_NAME', 'db_name');

	/** MySQL database username */
	define('DB_USER', 'db_username');

	/** MySQL database password */
	define('DB_PASSWORD', 'db_password');

	/** MySQL hostname */
	define('DB_HOST', 'localhost');

	/** Database Charset to use in creating database tables. */
	define('DB_CHARSET', 'utf8');

	/** The Database Collate type. Don't change this if in doubt. */
	define('DB_COLLATE', '');
}