(Squash)Add class GrabberBackground that returns backgrounds for movie, add to module can_haz_poster self method grab_bg wich will call class method and return the backgrounds for movie, add integration test on class GrabberBackground and fixtures for it

Changed class names to BackdropGrabber and PosterGrabber, removed two nokogiri requests from BackdropGrabber, changed integration test

Update .gitignore

Update integration_spec.rb

Delete request to current movie and to the "show all" link on the page of movie

Return second and third request, without them test fails
Merge after squash