Some Menu seed.
Menu modelling modifications:

* Including name as part of menu item different from description
* Include size and flavour defaults when we want to quickly model an individual menu item just with name and price
* Some modifications to expanded menu method ( need to check it. What happen for example in ice-cream when we invoke this method... I get 1Kg of
every flavour that I had. Maybe we can add some metadata for those cases to differenciate from pizza where I want all the combinations of pizza
flavours with their respective prices. (I was thinking of maybe a samePrizeForAllFlavours flag, that could even match case of gaseosas for example)