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.

src/audit_log_writer.h

@@ -33,9 +33,9 @@ class AuditLogWriter {
  public:
     explicit AuditLogWriter(AuditLog *audit)
         : m_audit(audit),
-        m_refereceCount(1) { }
+        m_refereceCount(0) { }
 
-    ~AuditLogWriter() { }
+    virtual ~AuditLogWriter() { }
 
     virtual void refCountIncrease() = 0;
     virtual void refCountDecreaseAndCheck() = 0;