Configurable product example with Manager

Starting an example for a config product fixture.

Didn't use a scenario outline for different options, as this would load the config fixture 3 times and load simple products 3 times for each of them (real slow).

There, I tried using a table instead. Then you can loop through the TableNode and get each associated product.

However, looking at the page html, I can see some magento js sorcery going on with the options, so need to investigate how to use them.