added controls that this knucklehead can understand

src/main.cpp

@@ -92,10 +92,10 @@ struct Scene {
     if (glutKeyIsDown('a')) {
       pos -= speed * right;
     }
-    if (glutKeyIsDown('r')) {
+    if (glutKeyIsDown('r') || glutKeyIsDown('e')) {
       pos += speed * up;
     }
-    if (glutKeyIsDown('f')) {
+    if (glutKeyIsDown('f') || glutKeyIsDown('q')) {
       pos -= speed * up;
     }
   }