Resolve "Revisit demos (formerly called examples) and update them"

Closes #209 (closed)

include/core/factor/factor_feature_dummy.h

-#ifndef FACTOR_EPIPOLAR_H
-#define FACTOR_EPIPOLAR_H
+#ifndef FACTOR_FEATURE_DUMMY_H
+#define FACTOR_FEATURE_DUMMY_H
 
 #include "core/factor/factor_base.h"
 
@@ -52,7 +52,7 @@ class FactorFeatureDummy : public FactorBase
 inline FactorFeatureDummy::FactorFeatureDummy(const FeatureBasePtr& /*_feature_ptr*/, const FeatureBasePtr& _feature_other_ptr,
                                               const ProcessorBasePtr& _processor_ptr,
                                               bool _apply_loss_function, FactorStatus _status) :
-        FactorBase("EPIPOLAR", nullptr, nullptr, _feature_other_ptr, nullptr, _processor_ptr, _apply_loss_function, _status)
+        FactorBase("FEATURE DUMMY", nullptr, nullptr, _feature_other_ptr, nullptr, _processor_ptr, _apply_loss_function, _status)
 {
     //
 }
@@ -65,4 +65,4 @@ inline FactorBasePtr FactorFeatureDummy::create(const FeatureBasePtr& _feature_p
 
 } // namespace wolf
 
-#endif // FACTOR_EPIPOLAR_H
+#endif // FACTOR_FEATURE_DUMMY_H