Attempt to fix travis issues

- Remove node_modules caching
- Regen package-lock just in case

Author: dfreedm

.travis.yml

@@ -11,9 +11,6 @@ addons:
       - google-chrome
     packages:
       - google-chrome-stable
-cache:
-  directories:
-  - node_modules
 before_script:
 - npm install -g gulp-cli@1
 - gulp lint-eslint