Add nodejs 0.8, 5, and 6 to travis config

Author: tarmolov

.travis.yml

@@ -1,10 +1,11 @@
 language: node_js
 node_js:
+- "0.8"
 - "0.10"
-- "0.11"
 - "0.12"
-- "4.0"
-- "4.1"
+- "4"
+- "5"
+- "6"
 sudo: false
 after_success:
 - "npm run coverage"