Merge remote-tracking branch 'upstream/dev' into http-zeroconf

.github/ISSUE_TEMPLATE.md

.gitignore

config/configuration.yaml.example

homeassistant/bootstrap.py

homeassistant/components/alarm_control_panel/__init__.py

homeassistant/components/alarm_control_panel/mqtt.py

homeassistant/components/automation/mqtt.py

homeassistant/components/binary_sensor/mqtt.py

homeassistant/components/demo.py

homeassistant/components/device_tracker/__init__.py

homeassistant/components/device_tracker/mqtt.py

homeassistant/components/device_tracker/netgear.py

homeassistant/components/device_tracker/owntracks.py

homeassistant/components/discovery.py

homeassistant/components/frontend/version.py

...components/frontend/www_static/fonts/roboto/COPYRIGHT.txt

...s/frontend/www_static/fonts/roboto/DESCRIPTION.en_us.html

...t/components/frontend/www_static/fonts/roboto/LICENSE.txt

...components/frontend/www_static/fonts/roboto/METADATA.json

...ponents/frontend/www_static/fonts/roboto/Roboto-Black.ttf