- Push messaging - message versioning
https://github.com/openpeer/opios-production/issues/60

- Push messaging - stack folder versioning
https://github.com/openpeer/opios-production/issues/59

- Push messaging - stack API implementation
https://github.com/openpeer/opios-production/issues/64

- Push messaging - stack mark read logic
https://github.com/openpeer/opios-production/issues/87

- Push messaging - stack delete message logic
https://github.com/openpeer/opios-production/issues/88