roles/homeassistant: Deploy Home Assistant

This commit introduces a *homeassistant* role that installs and sets up
Home Assistant using `pip`.

roles/homeassistant/templates/configuration.yaml.j2

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+homeassistant:
+  # Name of the location where Home Assistant is running
+  name: Home
+  # Location required to calculate the time the sun rises and sets
+  latitude: 38.9568
+  longitude: -94.6832
+  # Impacts weather/sunrise data (altitude above sea level in meters)
+  elevation: 0
+  # metric for Metric, imperial for Imperial
+  unit_system: imperial
+  # Pick yours from here: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+  time_zone: America/Chicago
+  # Customization file
+  customize: !include customize.yaml
+
+# Configure a default setup of Home Assistant (frontend, api, etc)
+default_config:
+
+# Show the introduction message on startup.
+introduction:
+
+# Uncomment this if you are using SSL/TLS, running in Docker container, etc.
+# http:
+#   base_url: example.duckdns.org:8123
+http:
+  server_host: '::1'
+
+# Sensors
+sensor: !include sensors.yaml
+
+# Text to speech
+tts:
+  - platform: google
+
+group: !include groups.yaml
+automation: !include automations.yaml
+script: !include scripts.yaml

roles/homeassistant/templates/homeassistant.httpd.conf.j2

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+ProxyPreserveHost On
+ProxyRequests Off
+
+ProxyPass /api/websocket ws://localhost:8123/api/websocket
+ProxyPassReverse /api/websocket ws://localhost:8123/api/websocket
+ProxyPass / http://localhost:8123/
+ProxyPassReverse / http://localhost:8123/
+
+RewriteEngine on
+RewriteCond %{HTTP:Upgrade} =websocket [NC]
+RewriteRule /(.*)  ws://localhost:8123/$1 [P,L]
+RewriteCond %{HTTP:Upgrade} !=websocket [NC]
+RewriteRule /(.*)  http://localhost:8123/$1 [P,L]