App pages changed: fix youtube_video_ids and rating_distribution

update test pages and the test expectations to pass w/new test
pages
fix leaderboard scraping and tests

the leaderboard page changed and this updates the scraping to
work.  It also updates the pages used for the tests to newer
versions.

the Rakefile is updated to fetch the leaderboards of the actual
category, since the tests pretend the data is for the ARCADE
category.
.gitignore: ignore vendor_bundle to hold vendored gems

if you want to bundle install but have the gems kept
local to this project:
bundle install --path vendor_bundle
Merge pull request #17 from rliebling/update_for_play_site_changes

Update for play site changes