switched to NPM (from Yarn which has issues with versions of can dependencies)

Author: ilyavf

.travis.yml

@@ -4,6 +4,5 @@ before_install:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
 node_js: 7.3
-cache: yarn
 addons:
   firefox: "51.0"