Comments now have relative timestamps 

![screen shot 2014-10-07 at 12 56 54](https://cloud.githubusercontent.com/assets/2236852/4541770/10ebdcac-4e19-11e4-99b1-e207360ad170.png)

Comments now have relative timestamps across the site, with the timestamps also updating every 60 seconds.
@ironsidevsquincy Aim was for the code to be easier to modify in the future if alternate/additional functions need to be called at the points when discussion:timestamps is emitted.