Update travis to use nodejs 4.0 and 4.1

Author: aivus

.travis.yml

@@ -4,10 +4,11 @@ cache:
   directories:
     - node_modules
 node_js:
+  - "4.1"
+  - "4.0"
   - "0.12"
   - "0.11"
   - "0.10"
   - "iojs"
-  - "iojs-v1.0.4"
 after_success:
   - codeclimate-test-reporter < coverage/lcov.info