EmotionAll MVP

Users can choose from a list of trends in our database and see a heat map of the world based on the sentiment of tweets for that particular trend. 
This is essentially creating a wrapper (or service object) around the twitter API.  It'd be better if you took that approach here.

Perhaps:
```ruby
class TwitterService
  def self.client
     @client || Twitter::REST::Client.new ...
  end
end
```