Dino catalog

Basic CLI application as solution for dinodex exercise. @bwthomas how do I go about having it reviewed? 
So, instead this could read:
```
row[:carnivore] ||= @@carnivorous_dietes.include? row.field(:diet)
```
That is, if you were to make @@carnivorous_diets an array and used `||=` instead of the post conditional that you've used here.