reversible 0.1.2

A generic wrapper struct that provides reversible editing capabilities..
Documentation 
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use super::*;

#[test]
fn save_and_revert() {
    let mut rev = Reversible::new(4);
    assert_eq!(rev.as_mut(), &mut 4);
    *rev.as_mut() = 13;
    assert_eq!(rev.as_ref(), &4);
    assert_eq!(rev.as_mut(), &mut 13);
    rev.save();
    assert_eq!(rev.as_ref(), &13);
    *rev.as_mut() = 4;
    assert_eq!(rev.as_ref(), &13);
    assert_eq!(rev.as_mut(), &mut 4);
    rev.revert();
    assert_eq!(rev.as_mut(), &mut 13);
}