Deletion of FIFO file

It would be nice if removing the FIFO file would cause `mktrayicon` to exit automatically as if "q" was sent.

Unfortunately, this is not entirely trivial to implement. Have a look [here](http://stackoverflow.com/questions/18643486/detect-deletion-of-fifo-file-with-blocking-open) and send a patch my way if you know how to do it.

Start with the linked Stack Overflow discussion about detecting deletion of a FIFO during a blocking open. Determine how mktrayicon can treat FIFO removal like receiving “q”; done means the program exits automatically after the FIFO file is removed.

Written by the indexing model from the issue text.