Merge branch 'master' into stable
Support for timestamp in subscribe actions
Merge branch 'master' of http://github.com/devicehive/devicehive-.net into origin_master
Added retry if command polling throws exception
Added retry if notification polling throws exception
Fixed "initial notification list" usage
Merge branch 'master' of http://github.com/devicehive/devicehive-.net into origin_master

Conflicts:
	src/Client/DeviceHive.Client/Service/RestfulClientService.cs
	src/Device/DeviceHive.Device/Service/RestfulDeviceService.cs
	src/Server/DeviceHive.WebSockets/Controllers/ClientController.cs