Fixes #366 - default sort by created_at desc, add created_at sorts for customers and funding instruments
Only default sort created_at in activity, no default sort for search results
Fix test fixtures
Fixes #343 - bugs applying for a prod marketplace
Merge pull request #372 from kleinsch/default-sort

Default Sorting for Activity Pages
Merge pull request #373 from kleinsch/apply-fixes

Prod Marketplace Application Bugfixes