riordinato alcuni package e creato una prima implementazione di set e mergetemplate

utility/euler_tour/expressions/ExpressionTerm.java

@@ -0,0 +1,15 @@
+package utility.euler_tour.expressions;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 27/04/2014
+ * Time: 13:06
+ */
+public class ExpressionTerm {
+
+        public Integer getValue() { return 0; }
+        public String toString() {
+            return new String("");
+        }
+}