Function format_pretty_bin 

pub fn format_pretty_bin<N: Num + Display + Binary + PartialOrd + 'static>(
    num: N,
) -> String

Outputs a human readable string like:

let pretty = parse_int::format_pretty_bin(1024);
assert_eq!("0b100_0000_0000", pretty);

Floats do not implement LowerHex