Remove payments status page from developer hub
Fix upsell in AppSerializer and es_app_to_dict (bug 956820)

- Don't return upsell if in an excluded region
- Don't return upsell if it's not a public app
- Add tests
have ?vary=0 actually remove Vary headers
Merge pull request #1625 from diox/app-upsell-non-public

Fix upsell in AppSerializer and es_app_to_dict (bug 956820)
add tests for communication dashboard emails
Merge pull request #1579 from ngokevin/commemails

add tests for communication dashboard emails
Merge pull request #1634 from nearlyfreeapps/bug-946332

Remove payments status page from developer hub (bug 946332)
add iarc tos/privacy links (bug 931934)
Fix mkt.search.tests.test_api:TestApi.test_upsell