Merged ingredients into a single type.  References #34.

While the table situation is much cleaner, a few problems still
remain.  Ingredient validation works, recipe validation doesn't.  Some
details on recipe admin site stuff are disabled until everything
works.  Recipe to batch and batch to recipe conversion don't work
either.

Once recipe validation works, I can re-enable the rest.  The biggest
problem with recipe validation is the fact that we create
IngredientItems but don't save them to the database -- and then we try
to reach them.  Need to find a way around that.
Made minor progress.  References #34.

I changed how items were referenced on recipes and that seems a lot cleaner.

I have noticed something odd: when creating a batch from a recipe, the
recipe itself is duplicated.  This happens in production, too.  What's
up with that?  Probably going to leave that for a later fix.
Added the new models as a temporary workaround.  References #34.

The new code in meadery.py moved the data to the new models in
models.py.  The next step is to get rid of the old models and replace
them with the new models!
Redid the product move.  References #34.

Not just products needed to move.  All the objects that key on
products had to move too.  Oops!

Everything looks good.  I need to test some more, *then* I can blow
away the old models.
Removed old models.  References #34.

The old versions of the replaced models have been removed.  The list
of new models includes Recipe, Batch, Product, Jar, OrderItem,
CartItem, IngredientItem, and ProductView.  All order and picklist
information was deleted to make the transition easier.

Next up is a massive migration to rename the tables to their old
names.
Finished the model switcharoo.  References #34.

This takes care of the model changearounds.  I think the South stuff
is pretty sane.  I am chicken to try it on real data, though, just yet.

The suspicious operation bug is going to get fixed, then I'll close
this issue and roll a release.
Fixed suspicious operations.  Finishes #34.

Also added utils migrations directory.
Merge branch 'feature/issue-34' into develop