New Plugin: Nicecast Now Playing Logger

When streaming audio via Nicecast, if not using iTunes, you can use a crafted NowPlaying.txt file to send arbitrary metadata along with the audio stream. This is a good mechanism for announcing the song being played (via SSL/ITCH/SDJ) to listeners.

See http://www.rogueamoeba.com/nicecast/download/NicecastManual.pdf for structure and Nicecast implementation details.

Example Output grabbed from my current NowPlaying.txt file:

```plain
Title: Race Around the World
Artist: Waterflame
Album: [non-album tracks]
Time: 02:49.38
```

Nicecast shows it when broadcasting too:

![screen shot 2013-06-10 at 1 06 51 am](https://f.cloud.github.com/assets/1882/630272/60c83dec-d19c-11e2-9192-9559f72b8289.png)