Merge pull request #226 from rschamp/scratch-dependencies

Ensure scratch-* dependencies are up to date

.travis.yml

@@ -6,6 +6,9 @@ sudo: false
 cache:
   directories:
   - node_modules
+before_install:
+# Install the most up to date scratch-* dependencies
+- rm -rf node_modules/scratch-*
 after_script:
 - |
   # RELEASE_BRANCHES and NPM_TOKEN defined in Travis settings panel