Transitions

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**As of June 15, 2018, 500px is no longer available for 3rd-party access. 500px has shutdown their service to 3rd-party apps. You must manually remove any previous saved searches for 500px from Transitions.**

- Added Pixabay as a new image source
- Fix crash caused when using the default Unsplash photo source for automatic transitions
- Add an AI-assisted NSFW classification opt-in
- Request smaller images for thumbnails for flickr to save data
- Added opt-in for anonymous usage statistics