Update to the last rust-nightly.
Update to the last rust-nightly.

Version of rustc: 0.13.0-nightly (e09d98603 2014-11-18 23:51:43 +0000).

steveklabnik/ncollide,MichaelRiss/ncollide,MichaelRiss/ncollide,sebcrozet/ncollide,steveklabnik/ncollide,sebcrozet/ncollide