Add helper functions for making shared pointers to rules

- start work on item set class

spec/spec_helper.cpp

@@ -0,0 +1,5 @@
+#include "spec_helper.h"
+
+EqualsContainerConstraint<rule_tmap, rule_tmap_comparator> EqualsTransitionMap(const rule_tmap &expected) {
+    return EqualsContainer(expected, rule_tmap::elements_equal);
+}