Add server/performance section

[Jakub Cegiełka]

I think it will be nice to add section about server/performance. We can insert there another useful informations such as:

• for database server use Percona instead of MySQL,
• for better performance use PHP version >= 5.4,
• install some cache for PHP (apc, opcache),
• remember to disable Xdebug on production servers,
• use nginx + php-fpm instead of Apache2,
• remember to enabling Magento cache on production enviroment.

I think these tips will be very useful for other developers. What you thik guys?

[Nick Jones]

+1

[Nick Jones]

PR #14.