Merge branch 'mat' into 'master'

Matplotlib is not a build time dependency

See merge request !40

conda/meta.yaml

@@ -29,7 +29,6 @@ requirements:
     - bob.blitz
     - bob.core
     - bob.io.base >=2.0.9
-    - matplotlib {{ matplotlib }}
     - libblitz {{ libblitz }}
     - giflib {{ giflib }}
     - libpng {{ libpng }}