Rename Vector to Vect in order to avoid conflicting with std::vector::Vector.

Vect is not a very good name though.
Remove every `use std::vec::Vec`.

It is part of the Rust prelude now.
Update to the last Rust.

Version of rustc: 0.10-pre (3d9fdf7 2014-03-22 20:11:55 -0700)