Write unit tests for Vendor model
Update Vendor model with another test

Made the 'only contain what I want' test, and made the other tests
actually work.
Add word 'test' so test will run
Create tests subdirectory, update tests for compactness
Fix Pep8 issues with model tests
Test created/modified fields; get rid of extraneous image tests
Change u'id' from unicode to ascii string
Created a test for the product model

refs #16431
Use ForeignKey for foreign keys and NullBooleanField in tests
Create Product model
Changed link field from TextField to URLField

refs #16431
Merge branch 'feature/16431' of github.com:osu-cass/whats-fresh-api into feature/16431

Conflicts:
	project_fish/whats_fresh/tests/test_products_model.py
Updated link field from TextField to URL field

refs #16431

Updated the link field in the product model to match the test.
Added a bunch of requirements to the requirements file

refs #16431
Merge branch 'feature/16431' into develop

Conflicts:
	project_fish/whats_fresh/tests/testdata/media/cat.jpg
	project_fish/whats_fresh/tests/testdata/media/dog.jpg