Upgrade to 3.8.1

Hi guys,

Here is my virgin TKLDev update...! Yay!

I changed the name of the WP plugins so that they auto install the latest versions... I'm not sure if that's the best way to go, but that's what I did... I started working out the latest version of each one but figured that was a slow painful way to go and I figure that then they will automatically be at the latest version everytime WP appliance gets rebuilt....

As you can also see I adjusted the permissions on /var/www/wordpress/wp-content and added a line to the wp-config.php file - this is as per [this issue](https://github.com/turnkeylinux/tracker/issues/173)

Keen for feedback! :)