* Added osramlighrify groups.
Allows you to make use of the build in osram lightify groups. Group states get
handeled similar as in the case of phillips hue. A lightify group shows up as
light in the homeassistant webinterface. If one light of the
group is on, the complete group is considered to be on.
To use this feature, first define some groups within your lighrify bridge, then
set add `allow_lightify_groups=true` to you osramlightify config.
It might look like:
````yaml
- platform: osramlightify
host: IP-ADDRES
allow_lightify_groups: true
```
* Fixed Pylint errors.
* Included requests.
* Included more requests.
* Fixed setup bridge and removed _light attribute.
* Update osramlightify.py
deisi