Create structure for day 20's project and writeup
Created sample project for Photos framework
Licenses and boilerplate
Creates a simple app which uses the photos framework

All of the photos are shown in a simple collection view
Remove unnecessary ViewController
Spot of refactoring
The image manager now uses caching

This commit creates a cache controller which is used to manage what
assets should currently be maintained in the cache.
You can now perform changes and respond to changes in the library

This is demonstrated with a favourite button
Created most of the photo kit outline
Wrote about grabbing assets from the image manager
Completed technical part of writeup, and added screenshots
Wrote intro and conclusion
Resized images for blog
Typo in asset file name
Merge branch 'days/20-photos-framework'