Try to use container image from DockerHub

scripts/travis-test.sh

@@ -5,11 +5,10 @@ docker exec -i devstack /bin/bash -s <<EOF
 #cd /tmp/edx-theme
 #sudo git clone -b oxa/devfic https://github.com/Microsoft/edx-theme.git
 #cp -r -u /tmp/edx-theme /edx/app/edxapp/themes
-cd /edx/app/edxapp/themes
-sudo rm -r *
-cd ..
-sudo git clone -b oxa/devfic https://github.com/Microsoft/edx-theme.git themes
 sudo su edxapp
+cd /edx/app/edxapp
+rm -r -d -f themes
+sudo git clone -b oxa/devfic https://github.com/Microsoft/edx-theme.git themes
 source /edx/app/edxapp/edxapp_env
 cd /edx/app/edxapp/edx-platform
 # Updates requirements and compiles javascript, Sass and CoffeeScript