Adding #syncwatch

This is supposed to help people watch shows together.
Example: #syncwatch1:10:5 Would make a 1hour 10minutes 5 seconds timer.
![shutuppngisbetterforthis](https://cloud.githubusercontent.com/assets/3243212/4999171/275a45ea-69e0-11e4-8349-a6bf3eb59946.png)

I don't know JavaScript, so I probably did a lot of retarded things.
In time/client you can probably delete the syncwatch element to optimize, but I didn't found how.

Feel free to trash this code if it's unusable.


This introduces up to a 9 second delay of parsing new syncwatch elements. Best deal with the slight overhead, in favour of faster element recognition.