Adding report abuse on comments

Adding report abuse JS version that doesn't link to R2.
We will be looking for a solution that completely decouples this from D2 (Non-JS version).

## Show me the pretty
![reportabuse](https://cloud.githubusercontent.com/assets/31692/3094364/aa2010da-e5bb-11e3-97c8-b00851919267.png)
![reportabuse prettier](https://cloud.githubusercontent.com/assets/31692/3094912/8ccc13a2-e5c1-11e3-836c-ad751525dc8f.png)


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![Tell on you](http://stream1.gifyo.com/pictures/5/large/fcfa53c0b03240c5098a0a79868ac723-600591613.gif)