Added documentation and logo for eddystone_temperature platform. (#2334)

* Added documentation and logo for eddystone_temperature platform.

* Update sensor.eddystone_temperature.markdown

Fixed formatting and removed unnecessary shortenings.

source/_components/sensor.eddystone_temperature.markdown

@@ -0,0 +1,57 @@
+---
+layout: page
+title: "Eddystone Beacon"
+description: "Instructions on how to integrate Eddystone beacons with Home Assistant in order to receive temperature data."
+date: 2017-03-26 01:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: eddystone.png
+ha_category: DIY
+ha_release: 0.42
+ha_iot_class: "Local Polling"
+---
+
+The `eddystone_temperature` sensor platform reads temperature information from Bluetooth LE advertisements transmitted by [Eddystone](https://en.wikipedia.org/wiki/Eddystone_(Google)) beacons. Your beacons must be configured to transmit UID frames (for identification) and TLM frames (for temperature).
+All beacons that support the Eddystone protocol, have a temperature sensor and can transmit TLM frames are compatible with this platform. For example [Gimbal](https://store.gimbal.com/collections/beacons/), [Estimote](http://estimote.com/) or [kontakt.io](https://kontakt.io/). For more manufacturers see [this overview](https://developers.google.com/beacons/eddystone#beacon_manufacturers) by Google.
+
+## Requirements
+
+As this platform uses `bluez` to scan for Bluetooth LE devices **a Linux OS with bluez installed** is required. In addition to that, the `libbluetooth` headers need to be installed:
+```shell
+$ sudo apt-get install libbluetooth-dev 
+```
+
+Scanning for Bluetooth LE devices also requires special permissions. To grant these to the python executable execute the following:
+```shell
+$ sudo apt-get install libcap2-bin
+$ sudo setcap 'cap_net_raw,cap_net_admin+eip' $(readlink -f $(which python3))
+```
+
+## Configuration
+
+To use your Eddystone beacon in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: eddystone_temperature
+    bt_device_id: 0  # optional
+    beacons:
+      living_room:
+        namespace: "112233445566778899AA"
+        instance: "000000000001"
+        name: "Living Room" # optional
+      kitchen:
+        namespace: "112233445566778899AA"
+        instance: "000000000002"
+        name: "Kitchen" # optional
+```
+Configuration variables:
+- **bt_device_id** (*Optional*): The id of the bluetooth device that should be used for scanning (hci*X*). You can find the correct one using `hcitool dev` (default: 0). 
+- **beacons** array (*Required*): The beacons that should be monitored.
+  - **[entry]** (*Required*): Name of the beacon.
+    - **namespace** (*Required*): Namespace ID of the beacon in hexadecimal notation. Must be exactly 20 characters (10 bytes) long.
+    - **namespace** (*Required*): Instance ID of the beacon in hexadecimal notation. Must be exactly 12 characters (6 bytes) long.
+    - **name** (*Optional*): Friendly name of the beacon.