Moved custom attributes examples to advanced subcategory.

examples/index.html

@@ -194,11 +194,6 @@
 				"webgl_animation_skinning_morph",
 				"webgl_camera",
 				"webgl_camera_logarithmicdepthbuffer",
-				"webgl_custom_attributes",
-				"webgl_custom_attributes_lines",
-				"webgl_custom_attributes_particles",
-				"webgl_custom_attributes_particles2",
-				"webgl_custom_attributes_particles3",
 				"webgl_decals",
 				"webgl_effects_anaglyph",
 				"webgl_effects_parallaxbarrier",
@@ -372,7 +367,12 @@
 				"webgl_buffergeometry_lines_indexed",
 				"webgl_buffergeometry_particles",
 				"webgl_buffergeometry_rawshader",
-				"webgl_buffergeometry_uint"
+				"webgl_buffergeometry_uint",
+				"webgl_custom_attributes",
+				"webgl_custom_attributes_lines",
+				"webgl_custom_attributes_particles",
+				"webgl_custom_attributes_particles2",
+				"webgl_custom_attributes_particles3"
 			],
 			"webgldeferred": [
 				"webgldeferred_animation",