Add Travis Retry

.travis.yml

@@ -4,9 +4,9 @@ language: node_js
 node_js:
 - '6'
 before_script:
-- npm install -g gulp
+- travis_retry npm install -g gulp
 - cd ./Tools/Gulp
-- npm install
+- travis_retry npm install
 - "export DISPLAY=:99.0"
 - "sh -e /etc/init.d/xvfb start"
 - sleep 3 # give xvfb some time to start