Added a travis config to set the .npmrc file (#535)

Author: bleathem

.travis.yml

@@ -11,6 +11,7 @@ env:
 
 before_install:
   - if [[ `npm -v` != 3* ]]; then npm i -g npm@3; fi
+  - if [[ -n ${NPM_TOKEN} ]]; then echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > .npmrc; fi
   - npm install -g bower grunt-cli
   - npm install git+https://github.com/patternfly/patternfly-eng-release.git