Aderk doesn't support reporting based on custom properties, so we will switch to keywords.

1. In adzerk/api.py, modify __add_targeting to set keywords instead of properties. Countries should be prefixed by country- and regions should be prefixed by region-.
2. Write a test in tests/test_adzerk_api.py to verify keywords are correctly passed to AdZerk.
3. Deploy the service to Pocket-Dev.
4. Hit the /spocs endpoint on the staging server and verify the keywords show up in the __debug__ object.
5. Create an ad in AdZerk and go through QA steps below.

QA:

• Target globally: ad should show up. (no keywords)
• Target the U.S.: ad should show up.

country-US

• Target California: ad should show up.

country-US,region-CA

• Target the west coast: ad should show up.

country-US,region-CA
country-US,region-OR
country-US,region-WA

• Target a different country: ad should not show up.

country-CA,region-CA

• Verify whether spaces after/before a comma matter: ad should show up.

country-US , region-CA

QA testing and table on interactions between keywords and site targeting is here: https://docs.google.com/document/d/1YHPr09aGir9cdLiTG1ugReEYTlVH7IG7zPfSQTIXA3U/edit#heading=h.x51rnaj5lg87