Sinatra reload

fixes #5 
Why is what needed?

> On Aug 14, 2014, at 8:17, Michal Kwiatkowski <notifications@github.com> wrote:
> 
> In app.rb:
> 
> > @@ -1,9 +1,43 @@
> >  require "sinatra/base"
> > +require "sinatra/reloader"
> > +require 'mongo'
> > +require 'json/ext'
> Hmm, why is this needed now? And don't tell me "I'm going to use that later", because YAGNI!
> 
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