Explain SPA codes in error legend (bug 1036461)
Merge pull request #514 from kumar303/spa-error-codes

Explain SPA codes in error legend (bug 1036461)
Add urls.py for SPA and use namespace
Set buyer on transaction for Boku (bug #1034305)

- Update solitude client to send buyer
- Update boku to set buyer on transaction create
- Update tests
Merge pull request #515 from JaredKerim-Mozilla/1034305

    Set buyer on transaction for Boku (bug #1034305)
Use existing wait-to-finish url (bug 1036974)
Merge pull request #516 from muffinresearch/1036974

Use existing wait-to-finish url (bug 1036974)
Add MISSING_ERROR_CODE to dev_messages
Merge pull request #517 from muffinresearch/add-missing-error-code

Add MISSING_ERROR_CODE to dev_messages