Add script for dumping existing data to json.
Suppress nested 'medicine' relation in Procurement model to avoid circular references when nesting Procurements with Medicines.
Add data dump to repo.
Remove Django requirements.
Remove 7 Django packages that we'll no-longer use.
Revise project structure.
Update .gitignore and README so it conforms to our project template. Add LICENSE file.
Merge branch 'develop' into refactor
Migrate existing db models from Django to SQLAlchemy.
Remove some more serialization from the model definitions.
Hook up json serializer to all models, using BaseSerializer.to_json().
Fix Medicine-Ingredient relationship by adding Component model and moving the 'strength' field to the Ingredient model.
Generalize Benchmark Price model.
Rename packsize to pack_size.
Bugfix Supplier model.
Update Medicine model.
Update our interface to the openexchangerates API.
Remove Currency model. Update Procurement model: calculate dollar-price only once, from a method.
Remove incoterm model. Rename AAVAILABLE_CURRENCIES to CURRENCIES.
Fix naming of source_id field. Fix calculation of average medicine price.