more encodings and their equivalents

our users use a bunch of things ruby does not support, after a bit of googling most of them are very similar to ISO_8859-X

not sure if there is a better place for there tests ...

@bf4 @jeremy 
so we blow up/do nothing instead of trying to fix it, from inbound mail
standpoint that does not make much sense to me :(


On Tue, Aug 26, 2014 at 3:42 PM, Jeremy Kemper <notifications@github.com>
wrote:

> In lib/mail/version_specific/ruby_1_9.rb:
>
> >          Encoding::GB18030
> >
> > +      when 'ansi_x3.110-1983'
> > +        Encoding::ISO_8859_1
>
> To expand on that: ANSI_X3.110-1983 is close to ISO-8859-1, but is not
> equivalent. Fuzzy/almost matching won't fly.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/mikel/mail/pull/772/files#r16747613>.
>