test travis

.travis.yml

@@ -6,6 +6,10 @@ go:
   - 1.7
   - master
 
+  before_install:
+    - if [[ `npm -v` != 3* ]]; then npm i -g npm@3; fi
+    - nvm use 6
+
 install:
   - export GO15VENDOREXPERIMENT=1
   - go get github.com/rakyll/statik