Merge branch 'pytest' of github.com:rflamary/POT into pytest

Author: rflamary

.travis.yml

@@ -13,6 +13,10 @@ matrix:
           python: 2.7
 before_install:
   - ./.travis/before_install.sh
+before_script: # configure a headless display to test plot generation
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
+  - sleep 3 # give xvfb some time to start
 # command to install dependencies
 install:
   - pip install -r requirements.txt