Adding voting field for idea comment.

#8 
When a user reset his vote and vote again his rating is increasing - we need to deal with that.

I also think we need to use the thumbs up and down similar to stack overflow when a question and an answer can get negative points.
![how to create node programmatic site install](https://f.cloud.github.com/assets/1222368/1175550/eb7cde76-215a-11e3-8402-89d4d4c85b7c.png)