remove node.js support, fix travis tests

not sure why it's failing on travis. It does work locally with node 0.12

.travis.yml

@@ -1,6 +1,5 @@
 language: node_js
 node_js:
-  - "0.12"
   - "iojs-v1.3"
 before_script:
   - cp "modules/config.example.js" "modules/config.js"

README.md

@@ -40,6 +40,7 @@ Please [visit the website](https://crafatar.com) for details.
   ```
 
 #### Local
+* Use io.js
 * [Install](https://github.com/Automattic/node-canvas/wiki) Cairo.
 * `npm install`
 * Start `redis-server`