Rebase of cheeaun/life#34 onto current master

[nogweii]

This is just updating @michaelowen's original pull request, #34. Here's a copy of his
description:

---

This simple modification will allow for optional tags by adding it at the end of your event, like so:

@USERNAME's life
===============

- 24/02/1955 Born
- ~1968 Summer job #job
- 03/1976 Built a computer #life #job
- 01/04/1976 Started a [company](http://en.wikipedia.org/wiki/Apple_Inc. "Apple Inc.") #job
- 04/1976-2011 Whole bunch of interesting events

These can then be easily styled with a custom css:

#life .event.tag-school .time {
    border: 4px solid #1abc9c;
}

#life .event.tag-job .time {
    border: 4px solid #3498db;
}

To see this working, I have it running myself currently and works like a charm:
http://timeline.owens.nl/