- Push presence API
https://github.com/openpeer/opios-production/issues/170

- Push presence - skeleton
https://github.com/openpeer/opios-production/issues/171

- Push presence - recheck
https://github.com/openpeer/opios-production/issues/179

- Push presence - register device to get presence pushes
https://github.com/openpeer/opios-production/issues/177

- Push presence - cancel logic
https://github.com/openpeer/opios-production/issues/173

- Push presence - step logic
https://github.com/openpeer/opios-production/issues/172