Treat mezcal as a seperate thing from tequila.
Adding Podfile for BlocksKit, but we need to use the 'next' branch for now.
Tweaking single ingredient chooser so it can be reused for creating a new ingredient.
Add IngredientItem.generic.

- not dynamic: won't update when we add the ability to add custom ingredients
  - efficient way to compute this on-the-fly (pointers between generics and specifics?)
- rearrange some code in RecipeIndex so it's under the right #pragma mark
- remove 'dry gin' as a first-class ingredient