update features with batch_to_space_nd_layer and space_to_batch_nd_layer

Author: haifenghan

FEATURES.md

@@ -7,6 +7,7 @@ New added features are compared with the original BVLC Caffe 1.0.0
 evconvert (TensorFlow/ONNX/... to Caffe Converter) related  
 ----------------------------------------------------------
 atan_layer  
+batch_to_space_nd_layer  
 crop_and_resize  
 depthtospace_layer  
 gather_layer  
@@ -25,6 +26,7 @@ resize_nearest_neighbor_layer
 round_layer  
 shape_layer  
 softsign_layer  
+space_to_batch_nd_layer  
 spacetodepth_layer  
 stack_layer  
 topk_gather_layer