removed likes on river item display

I removed the likes plugin's thumbs up from the river. Did you want vote up and down buttons in the river?

Also, why the odd images for voting up and down. This is what I see
![Screenshot from 2013-01-29 13 52 09](https://f.cloud.github.com/assets/199558/108174/e71bc5f4-6a44-11e2-920c-6c17f95e66ac.png)