try to load AS instead of seeing if it is loaded to avoid overwriting mb_chars

@bf4 @jeremy 

fixes #833 
pretty hard to test :D

FYI the original reason I found this is AS has a mb_chars implementation
that no longer can match against invalid chars -> blew up

On Tue, Nov 18, 2014 at 7:26 PM, Benjamin Fleischer <
notifications@github.com> wrote:

> In lib/mail.rb:
>
> >      require 'active_support/inflector'
> > -  else
> > +  rescue LoadError
>
> I suppose the tests not breaking is proof enough that it works?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/mikel/mail/pull/834/files#r20556030>.
>