[Rust] Implement Add trait for Vector class.

// Overloaded binary '+' operator
impl<T> Add for Vector<T> where T: Copy + fmt::Display + num::Num {
    type Output = Vector<T>;

    fn add(self: Vector<T>, other: Vector<T>) -> Vector<T> {
        if self.vec.len() != other.vec.len() {
            panic!("The length of the two vectors are unequal");
        }

        let mut v: Vec<T> = Vec::new();

        for i in 0..(self.vec.len()) {
            v.push(self.vec[i] + other.vec[i]);
        }

        Vector{ vec: v }
    }
}