Implement traits for Tuples

[fpdotmonkey]

The various traits this crate provides should be implemented for Tuples. This should be easy, if tedious to do.

My application is that I've written a sort of div_rem method for a type that returns the quotient and remainder as (T, Option<T>) where T: FloatEqAll, but I can't use float_eq stuff with that output easily since FloatEqAll isn't implemented for tuples.