Added boxes of Fedora 17 to the list

* Fedora 17 i386 (Puppet, Chef, VirtualBox 4.2.6);
* Fedora 17 x86_64 (Puppet, Chef, VirtualBox 4.2.6).

These boxes are created and tested with [**veewee**](https://github.com/jedi4ever/veewee) , builded on Mac OS X 10.6 Snow Leopard.