Remove dependencies with caffe

Hi guys, is it doable, in the short term, to remove the dependencies with caffe in this package?

As far as I know, this package uses the face detection and annotations from bob.ip.mtcnn. @heusch mentioned that this could be replaced by a tensorflow implementation of mtcnn. Is this doable?

ping https://gitlab.idiap.ch/bob/bob.nightlies/commit/0777c2b4548254e7663fd522ffc5500c3373c37e#note_48670

thanks