Add php5-mysql package

As discussed in #87 I added the php5-mysql package to the list of available packages. I'm not sure about the extra "business logic" in the BundleController, but I've put it there as a starting point for discussion. I'm curious what others think of it.
I guess you are testing that a php package can only be inserted once. right ?

Can you write a new test for it? Using one test for testing several things is not a good practice.