Move unit and price attributes to the Ingredient model
Update RecipesRepo with the new attributes
Update the RecipeTableSeeder
getAllowedUnitValues() in now in the Ingredient model
Update the 3rd step to provide default values for the unit and price
Move logic from the view (bad!) to the controller
Merge pull request #13 from AntoineAugusti/unit-price-in-ingredients

Move unit and price attributes from Quantity to Ingredient