Remove every `use std::vec::Vec`.

It is part of the Rust prelude now.

src/structs/dmat.rs

@@ -5,7 +5,6 @@
 use rand::Rand;
 use rand;
 use std::num::{One, Zero};
-use std::vec::Vec;
 use traits::operations::ApproxEq;
 use std::mem;
 use structs::dvec::{DVec, DVecMulRhs};

src/structs/dvec.rs

@@ -5,7 +5,6 @@
 use std::num::{Zero, One, Float};
 use rand::Rand;
 use rand;
-use std::vec::Vec;
 use std::slice::{Items, MutItems};
 use traits::operations::ApproxEq;
 use std::iter::FromIterator;

src/structs/vec.rs

@@ -4,7 +4,6 @@
 
 use std::cast;
 use std::num::{Zero, One, Float, Bounded};
-use std::vec::Vec;
 use std::slice::{Items, MutItems};
 use std::iter::{Iterator, FromIterator};
 use traits::operations::{ApproxEq, PartialOrd, PartialOrdering, Less, Equal, Greater, NotComparable};