Setup basic testing framework

examples/basic.cpp

@@ -1,6 +1,7 @@
 #include <glerminal.h>
 
 #include <cstdlib>
+#include <cmath>
 
 namespace
 {

examples/towers.cpp

@@ -7,6 +7,8 @@ namespace
 {
 	void init()
 	{
+		srand(0);
+		
 		glerminal_load_sprites_file("resources/towers.png");
 
 		for (int i = 0; i < LAYER_COUNT; i++)