Update to the last Rust.
Update to the last Rust.

Version of rustc: 0.10-pre (31e9c94 2014-02-28 00:26:34 -0800)

sebcrozet/nphysics,BenBergman/nphysics,tempbottle/nphysics,sebcrozet/nphysics,tempbottle/nphysics,MichaelRiss/nphysics