You can use the Application class to find the directory name where your Project Assets are stored - then cut up the path. That's the closest I know. Sample JS code would be:

function Start() {
    var dp : String = Application.dataPath;
    var s : Array;
    s = dp.Split("/"[0]);
    Debug.Log("project = " + s[s.length - 2]);
}

So if your Project Assets was in: C:\Current Projects\Labs\01 Box Demo\Assets, the output would be project = 01 Box Demo.