Replace mIRC "grey" with "teal/cyan" in Youtube output

Some CLI clients map the mIRC "grey" to an almost unusably dark colour, or potentially the same as the background colour, depending on client handling and terminal support.  This change replaces it with a readable colour.

Some examples:
![image](https://cloud.githubusercontent.com/assets/12193/4836375/4f65b9ce-5fc3-11e4-850e-847508cedef3.png)
![image](https://cloud.githubusercontent.com/assets/12193/4836392/977a81e0-5fc3-11e4-8957-18e59d0e3cc7.png)