moving xvfb to recommended section

Author: munderseth

.travis.yml

@@ -4,12 +4,10 @@ language:
 rvm:
   - 2.3.1
 
-before_install:
+before_script:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
   - sleep 3 # give xvfb some time to start
-
-before_script:
   - mkdir -p $HOME/bin
   - curl -fsSL https://testspace-client.s3.amazonaws.com/testspace-linux.tgz | tar -zxvf- -C $HOME/bin
   - testspace config url samples.testspace.com