added misc_exporter_collada to the examples index page

examples/files.js

@@ -347,6 +347,7 @@ var files = {
 		"misc_controls_pointerlock",
 		"misc_controls_trackball",
 		"misc_controls_transform",
+		"misc_exporter_collada",
 		"misc_exporter_gltf",
 		"misc_exporter_obj",
 		"misc_exporter_stl",