make gem lighter and remove a few things that are default

@bkeepers 
added back readme + license, better ?

On Thu, Nov 6, 2014 at 8:20 AM, Brandon Keepers <notifications@github.com>
wrote:

> In dotenv.gemspec:
>
> >    gem.homepage      = "https://github.com/bkeepers/dotenv"
> >    gem.license       = 'MIT'
> >
> > -  gem.files         = `git ls-files | grep -v rails`.split($\)
> > +  gem.files         = `git ls-files lib bin | grep -v rails`.split($\)
>
> I think I would prefer to keep all files in the gem. It bothers me when I
> inspect a gem and there is not a README.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/bkeepers/dotenv/pull/147/files#r19954782>.
>