Remove Zero and One impls

use libc::{c_int, c_ulong};

use std::{fmt, ptr};

use std::c_str::CString;

use std::num::{One, Zero};

use ffi;

use ssl::error::SslError;

    }

}

impl One for BigNum {

    fn one() -> BigNum {

        BigNum::new_from(1).unwrap()

    }

}

impl Zero for BigNum {

    fn zero() -> BigNum {

        BigNum::new_from(0).unwrap()

    }

    fn is_zero(&self) -> bool {

        unsafe {

            // It is raw contents of BN_is_zero macro

            (*self.raw()).top == 0

        }

    }

}

impl Eq for BigNum { }

impl PartialEq for BigNum {

    fn eq(&self, oth: &BigNum) -> bool {