Reddinator para Reddit

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- Updated logo (snoo was removed because it is now a reddit trademark).
- Added subscribe/unsubscribe functionality to subreddit feed menus.
- Added contextual selection of subreddit on submit screen.
- Added best sorting preference to front page.
- Added popular to default subreddits.
- Moved view all/search subreddits button to list view.
- Fixed gfycat preview url.