Add the featurename4value specification to the printed representation.

Author: johann-petrak

src/gate/plugin/learningframework/features/FeatureSpecNgram.java

@@ -56,6 +56,7 @@ public String toString() {
     return "NgramAttribute(name="+name+
             ",type="+annType+
             ",feature="+feature+
+            ",featureName4Value="+featureName4Value+
             ",number="+number;
   }