Improve caffe2npz in example/ssd

[Hakuyume]

New version shows how the layers are converted (BGR -> RGB, xy -> yx).

loading weights from VGG_VOC0712_SSD_300x300_iter_120000.caffemodel ...
conv1_1 -> extractor/conv1_1 (BGR -> RGB)
conv1_2 -> extractor/conv1_2
conv2_1 -> extractor/conv2_1
conv2_2 -> extractor/conv2_2
conv3_1 -> extractor/conv3_1
conv3_2 -> extractor/conv3_2
conv3_3 -> extractor/conv3_3
conv4_1 -> extractor/conv4_1
conv4_2 -> extractor/conv4_2
conv4_3 -> extractor/conv4_3
conv5_1 -> extractor/conv5_1
conv5_2 -> extractor/conv5_2
conv5_3 -> extractor/conv5_3
fc6 -> extractor/conv6
fc7 -> extractor/conv7
conv6_1 -> extractor/conv8_1
conv6_2 -> extractor/conv8_2
conv7_1 -> extractor/conv9_1
conv7_2 -> extractor/conv9_2
conv8_1 -> extractor/conv10_1
conv8_2 -> extractor/conv10_2
conv9_1 -> extractor/conv11_1
conv9_2 -> extractor/conv11_2
conv4_3_norm -> extractor/norm4
conv4_3_norm_mbox_loc -> multibox/loc/0 (xy -> yx)
conv4_3_norm_mbox_conf -> multibox/conf/0
fc7_mbox_loc -> multibox/loc/1 (xy -> yx)
fc7_mbox_conf -> multibox/conf/1
conv6_2_mbox_loc -> multibox/loc/2 (xy -> yx)
conv6_2_mbox_conf -> multibox/conf/2
conv7_2_mbox_loc -> multibox/loc/3 (xy -> yx)
conv7_2_mbox_conf -> multibox/conf/3
conv8_2_mbox_loc -> multibox/loc/4 (xy -> yx)
conv8_2_mbox_conf -> multibox/conf/4
conv9_2_mbox_loc -> multibox/loc/5 (xy -> yx)
conv9_2_mbox_conf -> multibox/conf/5

[yuyu2172]

It raised an error when I run the script on Python2.

AttributeError: 'module' object has no attribute 'fullmatch'

[Hakuyume]

Sorry, fullmatch doesn't exist in python2. I will replace it with match.

[yuyu2172]

LGTM.
It worked on Python2.