Make timestamps prettier and more useful
For recent timestamps we should display the duration since that timestamp, "prettify" it. We don't want the user to have to subtract the current time from the timestamp to find out how long ago something is.
Examples "2 minutes ago" "3 hours ago" etc.
Relevant links: http://stackoverflow.com/questions/13018550/time-since-ago-library-for-android-java http://www.ocpsoft.org/prettytime/