Component-wise division for Vector2

[alexkirsz]

Writing this as a follow-up to #475

I think it would make sense to also have component-wise division, as well as component-wise ceiling division for integer types.

See:

• https://github.com/rust-lang/rfcs/issues/2844
• https://docs.rs/nalgebra/0.25.3/nalgebra/base/struct.Matrix.html#method.component_div

[nical]

Sounds good to me. If you want to make a quick PR I'll review it.

[alexkirsz]

@nical I created two PRs: #481 and #482