Add JS to sort the implementations table by stars/last update

This should push abandoned/unpopular repos to the bottom of the page.
Add thumbnails to list of talks
Merge pull request #8 from pablosmedina/master

ckite updates
Add 10 new Raft implementations from GitHub search
akka-raft does support membership changes

As of today night akka-raft does support membership changes as described in the paper (incl. joint consensus phase).

The membership changes also include adding new nodes to the akka-cluster.

PS: Thanks for adding me to the list already! :-)
Merge pull request #9 from ktoso/patch-1

akka-raft does support membership changes
README: web site -> website
ckite updates