Added documentation for Skybell (#3511)

* Added documentation for Skybell

* Changed release version from 0.55 to 0.56

* All the blank lines

* Stray tab

source/_components/binary_sensor.skybell.markdown

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+---
+layout: page
+title: "Skybell Binary Sensor"
+description: "Instructions on how to integrate your Skybell HD devices within Home Assistant."
+date: 2017-10-03 16:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: skybell.png
+ha_category: Binary Sensor
+ha_release: 0.56
+ha_iot_class: "Cloud Polling"
+---
+
+To get your [Skybell.com](https://skybell.com/) binary sensors working within Home Assistant, please follow the instructions for the general [Skybell component](/components/skybell).
+
+Once you have enabled the [Skybell component](/components/skybell), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+binary_sensor:
+  - platform: skybell
+    monitored_conditions:
+      - button
+      - motion
+```
+
+Configuration variables:
+
+- **monitored_conditions** array (*Required*): Conditions to display in the frontend. The following conditions can be monitored.
+  - **button**: Return a boolean value when the doorbell button was pressed.
+  - **motion**: Return a boolean value when movement was detected by the Skybell doorbell.

source/_components/camera.skybell.markdown

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+---
+layout: page
+title: "Skybell Camera"
+description: "Instructions on how to integrate your Skybell HD devices within Home Assistant."
+date: 2017-10-03 16:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: skybell.png
+ha_category: Camera
+ha_release: 0.56
+ha_iot_class: "Cloud Polling"
+---
+
+To get your [Skybell.com](https://skybell.com/) cameras working within Home Assistant, please follow the instructions for the general [Skybell component](/components/skybell).
+
+Once you have enabled the [Skybell component](/components/skybell), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+camera:
+  - platform: skybell
+```

source/_components/light.skybell.markdown

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+---
+layout: page
+title: "Skybell Light"
+description: "Instructions on how to integrate your Skybell HD devices within Home Assistant."
+date: 2017-10-03 16:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: skybell.png
+ha_category: Light
+ha_release: 0.56
+ha_iot_class: "Cloud Polling"
+---
+
+To get your [Skybell.com](https://skybell.com/) LED light working within Home Assistant, please follow the instructions for the general [Skybell component](/components/skybell).
+
+Once you have enabled the [Skybell component](/components/skybell), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+light:
+  - platform: skybell
+```

source/_components/sensor.skybell.markdown

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+---
+layout: page
+title: "Skybell Sensor"
+description: "Instructions on how to integrate your Skybell HD devices within Home Assistant."
+date: 2017-10-03 16:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: skybell.png
+ha_category: Sensor
+ha_release: 0.56
+ha_iot_class: "Cloud Polling"
+---
+
+To get your [Skybell.com](https://skybell.com/) sensors working within Home Assistant, please follow the instructions for the general [Skybell component](/components/skybell).
+
+Once you have enabled the [Skybell component](/components/skybell), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: skybell
+    monitored_conditions:
+      - chime_level
+```
+
+Configuration variables:
+
+- **monitored_conditions** array (*Required*): Conditions to display in the frontend. The following conditions can be monitored.
+  - **chime_level**: Return a value between 0-3, indicating no chime, low, medium, and high respectively.

source/_components/skybell.markdown

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+---
+layout: page
+title: "Skybell"
+description: "Instructions on how to integrate your Skybell HD devices within Home Assistant."
+date: 2017-10-03 16:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: skybell.png
+ha_category: Hub
+ha_release: 0.56
+ha_iot_class: "Cloud Polling"
+---
+
+The `skybell` implementation allows you to integrate your [Skybell.com](https://skybell.com) doorbells in Home Assistant.
+
+Currently only the Skybell HD is supported by this platform.
+
+To enable devices set up with your [Skybell.com](https://skybell.com/) account, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+skybell:
+  username: you@example.com
+  password: secret
+```
+
+Configuration variables:
+
+- **username** (*Required*): The username for accessing your Skybell account.
+- **password** (*Required*): The password for accessing your Skybell account.
+
+Finish your configuration by visiting the [Skybell binary sensor](/components/binary_sensor.skybell/), [Skybell camera](/components/camera.skybell/), [Skybell light](/components/light.skybell/), [Skybell sensor](/components/sensor.skybell/), or [Skybell switch](/components/switch.skybell/) documentation.

source/_components/switch.skybell.markdown

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+---
+layout: page
+title: "Skybell Switch"
+description: "Instructions on how to integrate your Skybell HD devices within Home Assistant."
+date: 2017-10-03 16:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: skybell.png
+ha_category: Switch
+ha_release: 0.56
+ha_iot_class: "Cloud Polling"
+---
+
+To get your [Skybell.com](https://skybell.com/) switches working within Home Assistant, please follow the instructions for the general [Skybell component](/components/skybell).
+
+Once you have enabled the [Skybell component](/components/skybell), add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+switch:
+  - platform: skybell
+    monitored_conditions:
+      - do_not_disturb
+      - motion_sensor
+```
+
+Configuration variables:
+
+- **monitored_conditions** array (*Required*): Conditions to display in the frontend. The following conditions can be monitored.
+  - **do_not_disturb**: Control the state of your doorbells indoor chime.
+  - **motion_sensor**: Control the state of your doorbells motion sensor.