add multiverse for ubuntu

Author: Oscar Esteban

.travis.yml

@@ -16,6 +16,9 @@ before_install:
 - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then export PATH=/home/travis/miniconda2/bin:$PATH; else export PATH=/home/travis/miniconda3/bin:$PATH; fi
 - if $INSTALL_DEB_DEPENDECIES; then sudo rm -rf /dev/shm; fi
 - if $INSTALL_DEB_DEPENDECIES; then sudo ln -s /run/shm /dev/shm; fi
+# Enable universe and multiverse
+- sudo add-apt-repository "deb http://us.archive.ubuntu.com/ubuntu/ trusty universe multiverse"
+- sudo add-apt-repository "deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe multiverse"
 - bash <(wget -q -O- http://neuro.debian.net/_files/neurodebian-travis.sh)
 - sudo apt-get update
 - sudo apt-get install -qq xvfb libvtk6-dev python-vtk libx11-dev swig