Support for Blink camera system (#2207)

* Initial revision

* Updated per changes to PR

* Updated service names per latest PR commit

* Updated per requests in PR

source/_components/binary_sensor.blink.markdown

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+---
+layout: page
+title: "Blink Binary Sensor"
+description: "Instructions for how to setup Blink binary sensors within Home Assistant."
+date: 2017-03-05 22:13
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: blink.png
+ha_category: Binary Sensor
+ha_release: "0.40"
+---
+
+<p class='note'>
+To get your Blink binary sensors working with Home Assistant, follow the instructions for the general [Blink component](/components/blink/).
+</p>

source/_components/blink.markdown

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+---
+layout: page
+title: "Blink"
+description: "Instructions for how to integrate Blink camera/security system within Home Assistant."
+date: 2017-03-05 22:13
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: blink.png
+ha_category: Hub
+ha_release: "0.40"
+---
+
+The `blink` component lets you view camera images and motion events from [Blink](http://blinkforhome.com) camera and security systems.
+
+You will need your Blink login information (username, usually you email address, and password) to use this module.
+
+To set it up, add the following information to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+blink:
+  username: YOUR_USERNAME
+  password: YOUR_PASSWORD
+```
+
+Once loaded, your front end will have the following components:
+* A camera image for each camera in your system.
+* A binary_sensor per camera that indicates whether motion detection is enabled.
+* A binary_sensor for the system that indicates if the system is armed or disarmed.
+* A sesnor per camera that reports temperature.
+* A sensor per camera that reports battery level.
+* A sensor per camera that reports unread notification (ie. detected motion events).
+
+Since the cameras are battery operated, the images are only updated in Home Assistant when the user manually forces a new photo.  The image can only be updated in Home Assistant every 60 seconds in order to not overwhelm Blink's servers with API requests.
+
+Services:
+There are three services availiabe for the blink platform:
+- arm_system
+- arm_camera
+- snap_picture
+
+For arm_system, the value sent can be either "True" or "False" and will arm and disarm the whole blink system, respectively
+
+Arm system example
+```json
+{
+    "device_armed": "True"
+}
+```
+
+Arm camera follows a similar structure, but each indidivual camera can have motion detection enabled or disabled.  Because of this, you also need to supply a name.  For example, if I have a camera named "Living Room" and I want to turn off motion detection on that camera, I'd call the blink.arm_camera service with the following payload:
+```json
+{
+    "friendly_name": "Living Room",
+    "device_armed": "False"
+}
+```
+
+The blink.snap_picture service takes the camera name as the payload and with take a new picture with your camera.
+```
+{
+    "friendly_name": "Living Room"
+}
+```
+
+Configuration variables:
+
+- **username** (*Required*): Your username to login to Blink
+- **password** (*Required*): Your password to login to Blink
+
+<p class='img'>
+  <img src='{{site_root}}/images/screenshots/blink_example_frontend.png' />
+</p>

source/_components/camera.blink.markdown

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+---
+layout: page
+title: "Blink Camera"
+description: "Instructions for how to setup Blink cameras within Home Assistant."
+date: 2017-03-05 22:13
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: blink.png
+ha_category: Camera
+ha_release: "0.40"
+---
+
+<p class='note'>
+To get your Blink cameras working with Home Assistant, follow the instructions for the general [Blink component](/components/blink/).
+</p>

source/_components/sensor.blink.markdown

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+---
+layout: page
+title: "Blink Sensor"
+description: "Instructions for how to setup Blink sensors within Home Assistant."
+date: 2017-03-05 22:13
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: blink.png
+ha_category: Sensor
+ha_release: "0.40"
+---
+
+<p class='note'>
+To get your Blink sensors working with Home Assistant, follow the instructions for the general [Blink component](/components/blink/).
+</p>