Broken links for viewing examples on play.rust-lang.org

Hello,

It seems that the play links of the examples given on [IteratorExt](http://doc.rust-lang.org/std/iter/trait.IteratorExt.html)’s page are incorrect: they all yield the same code on play.rust-lang.org, which is the code of the very first example on that page.

Regards,
Ivan
