Graphviz is a before_install dependency

Author: ashgillman

.travis.yml

@@ -19,12 +19,12 @@ before_install:
   if $INSTALL_DEB_DEPENDECIES; then sudo ln -s /run/shm /dev/shm; fi &&
   bash <(wget -q -O- http://neuro.debian.net/_files/neurodebian-travis.sh) &&
   sudo apt-get -y update &&
-  sudo apt-get -y install xvfb fusefat &&
+  sudo apt-get -y install xvfb fusefat graphviz &&
   if $INSTALL_DEB_DEPENDECIES; then travis_retry sudo apt-get install -y -qq
   fsl afni elastix fsl-atlases; fi &&
   if $INSTALL_DEB_DEPENDECIES; then
     source /etc/fsl/fsl.sh;
-    source /etc/afni/afni.sh; 
+    source /etc/afni/afni.sh;
     export FSLOUTPUTTYPE=NIFTI_GZ; fi }
 - travis_retry bef_inst
 install:
@@ -33,7 +33,7 @@ install:
   conda config --add channels conda-forge &&
   conda update --yes conda &&
   conda update --all -y python=$TRAVIS_PYTHON_VERSION &&
-  conda install -y nipype graphviz &&
+  conda install -y nipype &&
   rm -r /home/travis/miniconda/lib/python${TRAVIS_PYTHON_VERSION}/site-packages/nipype* &&
   pip install -r requirements.txt &&
   pip install -e .[$NIPYPE_EXTRAS] &&