add multi_sources_images_data_layer.cpp
add multi_sources_images_data_layer.cpp

zimenglan-sysu-512/pose_action_caffe,zimenglan-sysu-512/pose_action_caffe,zimenglan-sysu-512/pose_action_caffe,zimenglan-sysu-512/pose_action_caffe,zimenglan-sysu-512/pose_action_caffe