contint: fix browsertests dependencies

package ruby1.9 does not exist :( sorry. We really want ruby1.9.3 which
is installed on the production slaves:

 ruby1.9 -> ruby1.9.3

Also since we are going to install MediaWiki, we might want Apache and
other php5 packages installed.  That is required before setting up the
vhost.

Change-Id: I37c9989eae70e843675171d0ca4e78cd3887eaef