Refactored dinodex based on Franco's comments

This can be abstracted into its own controller class for interaction with the user. This would make it easier to understand what's going on here. For example, something like:

```
class Controller
  def initialize
    @files = ["dinodex.csv", "african_dinosaur_export.csv"]
    ...
    ... (initiate interaction with user)
   end

  def get_user_input
    input  = gets.chomp.split(",")
    ... (whatever logic you want to run here)
  end
end
```

P.S. Use double-quotes over single quotes