[1.8.0](https://github.com/ladybug-tools/honeybee-radiance/compare/v1.7.0...v1.8.0) (2020-02-02)
Features
* **properties:** Add a base Properties class for others to use ([49bab72](https://github.com/ladybug-tools/honeybee-radiance/commit/49bab72061decb804cb828a555ca179c5d82b3bb))
* **properties:** Add extension properties for all Model obects ([73473a3](https://github.com/ladybug-tools/honeybee-radiance/commit/73473a3330ab5f012a8a33750a9fa709cc1f2435))