TV endpoint documentation

## Changes in this pull request

Documented the two existing channels, and the new ones that were added. Updated node-notifier module.

### New channels added
I have issued a [pull request on the main apis repository](https://github.com/kristjanmik/apis/pull/92). 
There I added more channels to the endpoint. Those channels have been documented in this pull request.

#### Channels that were added
* Rúv íþróttir
* Stöð 2 Sport
* Stöð 2 Sport 2
* Stöð 2 Gull
* Stöð 2 Bíó
* Stöð 3
* Skjár 1

## Node-notifier module updated

Was having problems running the apis-docs app in development mode on Ubuntu 14.04. The reason was the node-notifier module. I updated the module to the latest version `3.0.6` and added line of code where a new notifier object is created.