Added include and exclude functionality to history component (#1094)

* Added lgtv platform to control a LG Smart TV running NetCast 3.0
(LG Smart TV models released in 2012) and NetCast 4.0 (LG Smart TV models released in 2013).

* Update media_player.lgtv.markdown

* Rename media_player.lgtv.markdown to media_player.lg_netcast.markdown

* added description of the include/exclude entities/domains feature for history component.

* o moved configuration examples to the section where the filtering is explained
o improved configuration variables description

source/_components/history.markdown

@@ -18,7 +18,7 @@ The `history` component will track everything that is going on within Home Assis
 To enable the history option in your installation, add the following to your `configuration.yaml` file:
 
 ```yaml
-# Example configuration.yaml entry
+# Basic configuration.yaml entry
 history:
 ```
 
@@ -32,6 +32,56 @@ history:
 Events are saved in a local database. Google Graphs is used to draw the graph. Drawing is happening 100% in your browser. No data is transferred to anyone at any time.
 </p>
 
+
+Configuration variables:
+
+- **exclude** (*Optional*): Configure which components should **not** be displayed. 
+  - **entities** (*Optional*): The list of entity ids to be excluded from the history.
+  - **domains** (*Optional*): The list of domains to be excluded from the history.
+- **include** (*Optional*): Configure which components should be displayed. 
+  - **entities** (*Optional*): The list of entity ids to be included from the history.
+  - **domains** (*Optional*): The list of domains to be included from the history.
+
+Without any `include` or `exclude` configuration the history displays graphs for every entity (well that's not exactly true - for instance `hidden` entities or `scenes` are never shown) on a given date. If you are only interested in some of the entities you several options:
+
+- Define domains and entities to `exclude` (aka. blacklist). This is convenient when you are basically happy with the information displayed, but just want to remove some entities or domains. Usually these are entities/domains which do not change (like `weblink`) or rarely change (`updater` or `automation`).    
+```yaml
+# Example configuration.yaml entry with exclude
+history:
+  exclude:
+    domains:
+      - automation
+      - weblink
+      - updater
+    entities:
+      - sensor.last_boot
+      - sensor.date
+```
+- Define domains and entities to display by using the `include` configuration (aka. whitelist). If you have a lot of entities in your system and your `exclude` lists possibly get very large, it might be better just to define the entities or domains to display. 
+```yaml
+# Example configuration.yaml entry with include
+history:
+  include:
+    domains:
+      - sensor
+      - switch
+      - media_player
+```
+- Use the `include` list to define the domains/entities to display, and exclude some of them with in the `exclude` list. This makes sense if you for instance include the `sensor` domain, but want to exclude some specific sensors. Instead of adding every sensor entity to the `include` `entities` list just include the `sensor` domain and exclude the sensor entities you are not interested in.   
+```yaml
+# Example configuration.yaml entry with include and exclude
+history:
+  include:
+    domains:
+      - sensor
+      - switch
+      - media_player
+  exclude:
+    entities:
+     - sensor.last_boot
+     - sensor.date
+```
+
 #### {% linkable_title Implementation details %}
 
 The history is stored in a SQLite database `home-assistant.db` within your config directory.