Use human readable date in process names

Resque workers process line displaying unix timestamp is pretty useless, especially when viewing the process list. It's impossible to tell if a job is taking too long from unix timestamp. 

In case of shell scripts, it's possible to get process run time using other means, i.e.:

```bash
PID=<resque_worker_pid>
SECONDS_RUNNING=`expr $(awk -F. '{print $1}' /proc/uptime) - $(expr $(awk '{print $22}' /proc/${PID}/stat) / 100)`
```

This is a proposal to print human readable date in procline.