More material love for interface

config/custom_components/example.py

homeassistant/components/device_tracker.py

homeassistant/components/group.py

homeassistant/components/http/frontend.py

homeassistant/components/http/www_static/frontend.html

homeassistant/components/http/www_static/polymer/bower.json

...stant/components/http/www_static/polymer/domain-icon.html

...omponents/http/www_static/polymer/home-assistant-api.html

...mponents/http/www_static/polymer/home-assistant-main.html

...stant/components/http/www_static/polymer/state-badge.html

...istant/components/http/www_static/polymer/state-card.html

...tant/components/http/www_static/polymer/states-cards.html

homeassistant/components/light/__init__.py

homeassistant/components/wemo.py