Poupou's Corner of the Web

Maybe a few people noticed Zoltan's patches to remove some "" inside corlib source code, I know I did. I also felt the urge to write a Gendarme rule to find all of them (fixing being another story that, like Gendarme, gladly accept contributions), so here's come UseStringEmptyRule and the mandatory unit tests.

Speaking of emptiness, I just watched Touching the Void on TV. Impressive and, as a bonus, I feel a lot less c12n tonight.