Simple labels can be printed.  Refs #22.

It is now possible to generate simple labels from the admin site.

Support exists for more sophisticated labels, but I need an elegant
way to locally customize the label selection so I can leave the
examples in the code and override them locally.
Updated documentation to reflect label status.  Refs #22.

The documentation shows that labels can be printed.
Added support for custom labels.  Refs #22.

There is a default label, and an interface for custom labels.  Put
your custom label classes in meadery_local.py and add a function
'generate_labels(batch)' to that file, and you are good to go!
Updated documentation.  Finishes #22.

The documentation now reflects the requirements for label generation.
Merge branch 'feature/issue-22' into develop