Balena-sdk

* *BREAKING* Change application.create() to support application types. 76 [Trong Nghia Nguyen]
* *BREAKING* Change device.name to device.device_name everywhere. 76 [Trong Nghia Nguyen]
* *BREAKING* Remove resin.models.build model which is replaced by release model. Remove resin.models.device.set_to_build() function. 76 [Trong Nghia Nguyen]
* Implement resin.models.config_variable.ApplicationConfigVariable model. 76 [Trong Nghia Nguyen]
* Implement resin.models.config_variable.DeviceConfigVariable model. 76 [Trong Nghia Nguyen]
* *BREAKING* Remove resin.models.environment_variables.ApplicationEnvVariable since it no longer exists in the model. Implement resin.models.environment_variables.ServiceEnvVariable model 76 [Trong Nghia Nguyen]
* *BREAKING*: Remove resin.models.DeviceEnvVariable since it no longer exist in the model. Implement resin.models.DeviceServiceEnvVariable model to work with Device Service Variables. 76 [Trong Nghia Nguyen]
* Add resin.models.service model to lookup for services. 76 [Trong Nghia Nguyen]
* Add resin.models.image to look up individual image build. 76 [Trong Nghia Nguyen]
* *Breaking*: Move to API v4 (Multicontainer support). 76 [Trong Nghia Nguyen]

* Fix device.get_status() function, use `last_vpn_event` field instead of `last_seen_time` since it no longer exists. 75 [Trong Nghia Nguyen]
* Fix return object of `create` functions to ensure they return a dict. 75 [Trong Nghia Nguyen]
* Fix resin.models.application.create() return object. 75 [Trong Nghia Nguyen]
* Update device.set_to_build() to work with latest API. Change the argument from build id to build commit hash since build id is not available on the dashboard. 75 [Trong Nghia Nguyen]

Changed

- Make `resin.models.config.getPubNubKeys()` and `resin.models.config.getMixpanelToken()` private.
- Fix `resin.models.device.generateUUID()` examples.

Added

- Implement `resin.models.device.restart()`.

Changed

- Upgrade Resin Settings Client to v3.1.0.

Changed

- Upgrade Resin Token to v2.4.2.