Moves mail body to an ERB template

It should be possible to pass locals, right?

> On 11 Nov 2014, at 12:32, Miguel Palhas <notifications@github.com> wrote:
> 
> In github-nice-guy.rb:
> 
> > @@ -16,20 +17,17 @@ def self.run
> >      end
> >  
> >      github = Github.new basic_auth: ENV["GITHUB_BASIC_AUTH"]
> > -    issues = github.search.issues q: "type:pr is:open user:#{ENV['SEARCH_USER']}"
> > +    @user = ENV['SEARCH_USER']
> I wasn't sure if this would be accessible in ERB otherwise
> 
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