Merge: Second batch of RosettaCode

In this one, I rewrote the commits to squash them, clean them and add tests.

Since the commits are rewrote, their sha1 differ so the PR numbers are added in the descriptions of the commits to keep track of the original request.

Pull-Request: #1519
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>
Reviewed-by: Romain Chanoir <chanoir.romain@courrier.uqam.ca>