Removing torch as dependency and matching the dependencies with bob-devel

Hey @heusch ,

I'm using buildout, so I need to apply some fixed to make it work. Could you please review it when you have the time?

Cheers

conda/meta.yaml

@@ -26,12 +26,13 @@ requirements:
     - bob.extension
     - bob.core
     - bob.bio.base
+    - bob.learn.pytorch
   run:
     - python
     - setuptools
     - docopt {{ docopt }}
-    - pytorch =0.3
-    - torchvision =0.1.8
+    - pytorch =0.4
+    - torchvision =0.2
 test:
   imports:
     - {{ name }}