add forth solution

I have two solutions:
- goal.fs - a compact, and short implementation for the golf game
- goal-full.fs - based on goal.fs, and with more input stream handling for multi-line input

see the output of these solutions on the ideone site:
- [goal.fs](http://ideone.com/6CRZc3)
- [goal-full.fs](http://ideone.com/w08gjA)