refactoring and cleanup

Mostly making it more concise / idiomatic Ruby.

@beechnut I'm assuming this is the PR you intended to make instead of https://github.com/codeforamerica/CutiesInDenver/pull/24
Ah thanks for catching that. That was me getting an individual pet. I'll remove that when I re-issue the request.

Sent from a mobile device

> On Jun 11, 2014, at 10:57 PM, Sarah Laplante <notifications@github.com> wrote:
> 
> In lib/cuties/adopt_a_pet.rb:
> 
> > @@ -7,10 +7,11 @@ class AdoptAPet
> >    URL = 'http://api.petfinder.com/pet.getRandom'
> >  
> >    PARAMS = {
> > -    :format => 'json',
> > -    :key => ENV.fetch('petfinder_key'),
> > -    :shelterid => 'MA38', # MSPCA in Jamaica Plain
> > -    :output => 'full'
> > +    format:    'json',
> > +    key:        ENV.fetch('petfinder_key'),
> > +    shelterid: 'MA38', # MSPCA in Jamaica Plain
> > +    # id: 29421606,
> I mean the id comment.
> 
> —
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