Update .gitignore

Author: joshbickett

.gitignore

@@ -162,13 +162,5 @@ cython_debug/
 .DS_Store
 
 # Avoid sending testing screenshots up
-screenshot.png
-screenshot_with_grid.png
-screenshot_with_labeled_grid.png
-screenshot_mini.png
-screenshot_mini_with_grid.png
-grid_screenshot.png
-grid_reflection_screenshot.png
-reflection_screenshot.png
-summary_screenshot.png
-operate/screenshots/
+*.png
+operate/screenshots/