Fix failing tests
Implemented Spotlite::Client using HTTParty #15
Clean 'Add a Plot' if description is empty

Additionally, return nil instead of empty string if description ends up being empty
Add @response instance variable

Now you can track the HTTP response of every request.

> movie = Spotlite::Movie.new 1234567
> movie.response
# => {:code => 200, :message => "OK"}

> movie = Spotlite::Movie.new 9999999
> movie.response
# => {:code => 404, :message => "Not Found"}
rescue nil for movie title