Bumping version for Twitter Algebird to latest

Originally when I included Algebird in the examples project, the latest version didn't target JDK 6, hence we went back to 0.1.8.

In https://github.com/twitter/algebird/pull/137 this is fixed so we can bump the version up.

This is nice since the latest Algebird has some other useful stuff like TopK counting via PriorityQueues, for example.