Merge pull request #370 from mozilla/development

Promote sharing changes to staging
Merge pull request #381 from mozilla/development

Development -> Staging
Merge pull request #393 from mozilla/staging

Staging -> Production
Adding debugging.
Remove some logging.
Merge branch 'development' into staging
Merge branch 'development' into staging
Merge branch 'staging' into production
Hotfix: don't accept non-string recipients
Add test for new assertion validation.