Handles better the memory utilization

- Added reference counts to Rule and AuditLog;
- Some memory leaks were removed, including GeoLookup;
- Deal better with parser errors;
- Overriding the AutlogLogWritter destructor.

test/common/modsecurity_test.cc

@@ -85,11 +85,13 @@ bool ModSecurityTest<T>::load_test_json(std::string file) {
             vec->push_back(u);
         }
     }
+
+    yajl_tree_free(node);
+
     return true;
 }
 
 
-
 template <class T>
 std::pair<std::string, std::vector<T *>>* ModSecurityTest<T>::load_tests() {
     DIR *dir;