Added a simple photon map debug viewer.

PhotonViewer/Makefile

@@ -0,0 +1,16 @@
+TARGET = pviewer
+OBJECTS = main.o
+CXXFLAGS = -ansi -pedantic -std=c++11 -g -Wall -DGLM_FORCE_RADIANS -I/usr/include/GL
+LDLIBS = -lglut -lGLU -lGL
+
+.PHONY: all
+all: $(TARGET)
+
+$(TARGET): $(OBJECTS)
+	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDLIBS)
+
+main.o: main.cpp
+
+.PHONY: clean
+clean:
+	$(RM) $(TARGET) *.o