Only run tests in node v4

Author: mjackson

.travis.yml

@@ -1,15 +1,13 @@
 language: node_js
 node_js:
-- '0.10'
-- '0.12'
-- '4'
+- "4"
 sudo: false
 before_script:
 - wget http://www.browserstack.com/browserstack-local/BrowserStackLocal-linux-x64.zip
 - unzip BrowserStackLocal-linux-x64.zip
-- ./BrowserStackLocal $BROWSER_STACK_ACCESS_KEY localhost,8001,0 > /dev/null &
+- "./BrowserStackLocal $BROWSER_STACK_ACCESS_KEY localhost,8001,0 > /dev/null &"
 - sleep 10
 branches:
   except:
     - latest
-    - /^v\d/
+    - "/^v\d/"