Adding in Array::iter and Array::to_vec

[Pauan]

There's a few reasons for this:

• Using array.to_vec() is more convenient and more efficient than using array.values().into_iter().map(|x| x.unwrap_throw()).collect::<Vec<_>>()

• Using array.iter() is much more efficient than using array.values().into_iter()

• The iterator returned by array.iter() supports size_hint, ExactSizeIterator, and DoubleEndedIterator, all of which cannot be supported by array.values()

[alexcrichton]

Looks great to me, thanks!

[alexcrichton]

👍