More doc comments

- Adds error conversion for Reader & Writer trait implementation.
- Adds various doc comments. 
Ouch, I found no calls and since the implementation looked too simple I
removed it. I will add it back tomorrow.

Le mer. 24 déc. 2014 22:31, Daniel Fagnan <notifications@github.com> a
écrit :

> In src/result.rs
> <https://github.com/thehydroimpulse/nanomsg.rs/pull/86#discussion-diff-22263977>
> :
>
> >
> > -impl FromError<io::IoError> for NanoError {
>
> We'll need this FromError to be able to work with try!.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/thehydroimpulse/nanomsg.rs/pull/86/files#r22263977>.
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