Add ClueSharp, ClueBot and ClueStick

ClueBot is a C# client for speed clue. It uses ClueSharp, a set of classes
used for representing speed clue data.

ClueStick is a (pretty stupid) C# AI. It plugs into the ClueBot client by
deriving from the IClueAI interface.

The only external dependency is NUnit.
Merge pull request #8 from jwg4/master

Add ClueSharp, ClueBot and ClueStick