new test 7

.travis/travis_before_install.sh

 #!/usr/bin/env bash
 # Install miniconda to avoid compiling scipy
 if ! test -e $HOME/miniconda2/bin ; then
+    rm -rf $HOME/miniconda2
     wget -c https://repo.continuum.io/miniconda/Miniconda2-4.1.11-Linux-x86_64.sh -O $HOME/download/miniconda.sh
     chmod +x $HOME/download/miniconda.sh
     $HOME/download/miniconda.sh -b