Fixed Mac OS X bug where request for one fullscreen window blacks out other monitors

src/cocoa_window.m

@@ -58,8 +58,12 @@ static void enterFullscreenMode(_GLFWwindow* window)
 
     _glfwSetVideoMode(window->monitor, &window->videoMode);
 
+	NSDictionary *opts = [NSDictionary dictionaryWithObjectsAndKeys:
+	      [NSNumber numberWithBool:NO], NSFullScreenModeAllScreens,
+	       nil];
+	       
     [window->ns.view enterFullScreenMode:window->monitor->ns.screen
-                             withOptions:nil];
+                             withOptions:opts];
 }
 
 // Leave fullscreen mode