Added karma price in item view

This will display the karma price of an item like so: 
![karma-view](https://f.cloud.github.com/assets/1114120/130607/003d4940-702b-11e2-9560-7cc6ac81021c.png)

The icon comes directly from the wiki but I believe that should be ok.

I just noticed that we might not have the karma price for every item but if there is a price set on GW2DB at least it will be displayed now.