Auto-updating Scoreboards! Whoooo

Example in action: **click each image to expand**
<a href="https://f.cloud.github.com/assets/627891/494133/94cd165a-bb88-11e2-8e9a-a31c92ef5016.png"><img src="https://f.cloud.github.com/assets/627891/494133/94cd165a-bb88-11e2-8e9a-a31c92ef5016.png" alt="s1_start" width=300 /></a> <a href="https://f.cloud.github.com/assets/627891/494134/98c4db62-bb88-11e2-8241-4bf313c5a14f.png"><img src="https://f.cloud.github.com/assets/627891/494134/98c4db62-bb88-11e2-8241-4bf313c5a14f.png" alt="s1_start" width=300 /></a>
<a href="https://f.cloud.github.com/assets/627891/494136/9cd75fae-bb88-11e2-8fbb-df242e9fe4a7.png"><img src="https://f.cloud.github.com/assets/627891/494136/9cd75fae-bb88-11e2-8fbb-df242e9fe4a7.png" alt="s1_start" width=300 /></a> <a href="https://f.cloud.github.com/assets/627891/494137/9eaa0d86-bb88-11e2-81ff-0458e787de10.png"><img src="https://f.cloud.github.com/assets/627891/494137/9eaa0d86-bb88-11e2-81ff-0458e787de10.png" alt="s1_start" width=300 /></a>

Note how the scoreboard went back to the normal one after the 10 seconds :D.

A new config option was added, `Scoreboards.liveUpdates`, to disable this functionality, in case that people get lag from it.