fix conda-forge channel, split anaconda download

Author: oesteban

.travis.yml

@@ -24,16 +24,17 @@ before_install:
     export FSLOUTPUTTYPE=NIFTI_GZ; fi }
 - function conda_inst {
   export CONDA_HOME=/home/travis/anaconda &&
-  wget https://repo.continuum.io/archive/Anaconda${TRAVIS_PYTHON_VERSION:0:1}-4.3.0-Linux-x86_64.sh
-  -O /home/travis/.cache/anaconda.sh &&
   bash /home/travis/.cache/anaconda.sh -b -p ${CONDA_HOME} &&
   export PATH=${CONDA_HOME}/bin:$PATH &&
-  conda config --append channels conda-forge &&
+  conda config --add channels conda-forge &&
   conda update --all -y python=$TRAVIS_PYTHON_VERSION &&
   conda install -y nipype icu==56.1 &&
   rm -r ${CONDA_HOME}/lib/python${TRAVIS_PYTHON_VERSION}/site-packages/nipype*; }
 #  Add install of vtk and mayavi to test mesh (disabled): conda install -y vtk mayavi
 - travis_retry apt_inst
+- travis_retry if [ ! -f /home/travis/.cache/anaconda.sh]; then
+  wget https://repo.continuum.io/archive/Anaconda${TRAVIS_PYTHON_VERSION:0:1}-4.3.0-Linux-x86_64.sh -O /home/travis/.cache/anaconda.sh;
+  fi
 - travis_retry conda_inst
 install:
 - travis_retry pip install -e .[$NIPYPE_EXTRAS]