Updated repositories for correct PHP 5.4 location

It would appear that the [ondrej/php5 ubuntu repository](https://launchpad.net/~ondrej/+archive/php5) has been upgraded to php 5.5.1-1 by default.

This breaks the UI option to specify your PHP version as 5.4. This PR sets the 5.4 radio button to select the [ondrej/php5-oldstable ubuntu repository](https://launchpad.net/~ondrej/+archive/php5-oldstable)

***Note***
Defaulting to ppa:ondrej/php5 breaks some other things unexpectedly when running 5.5.x
* For php5-fpm, configurations have been moved to /etc/php5/fpm. I'm unsure of the best way to fix this in src/Puphpet/View/Vagrant/Modules/php.pp.twig
* php5-memcached doesn't install correctly, it's unable to install the libmemcached10 dependency