Use live timestamps for update dates

I had this originally, but my local test data at the time had lots of updates posted close together. This made the UI look awful with a whole string of "x minutes ago" posts.   However, in reality, it looks pretty good and takes care of many of the issues people have with the timestamps.

![timetext in action](https://f.cloud.github.com/assets/338853/2226948/559dac32-9ab3-11e3-84af-24c1bacc6a2d.png)

:eyeglasses: @chromakode