Revert "Removed bob.ip.mtcnn, bob.bio.caffe_face and bob.ip.caffe_extractor [skip ci]"

This reverts commit 0777c2b4.

order.txt

@@ -38,6 +38,7 @@ bob/bob.ip.qualitymeasure
 bob/bob.ip.skincolorfilter
 bob/bob.ip.facelandmarks
 bob/bob.ip.dlib
+bob/bob.ip.mtcnn
 bob/bob.db.arface
 bob/bob.db.asvspoof
 bob/bob.db.asvspoof2017
@@ -118,6 +119,8 @@ bob/bob.db.ldhf
 
 # Feature extractors packages
 bob/bob.ip.tensorflow_extractor
+bob/bob.ip.caffe_extractor
+bob/bob.bio.caffe_face
 bob/bob.learn.tensorflow
 
 bob/bob.learn.pytorch