Summary:
Offering this open to a bit of a discussion based on the comments at #77.
- Created two new schemes (IGListKitTodayExample, IGListKitMessageExample) in which respectively correspond to their app extension.
- Updated the Podfile to ensure they have IGListKit as a dependency
- Added a super simple example reusing the `LabelSectionController` from the main app
Done more as a 'yes it can be done' as opposed to 'look at what can be done' hence the basic functionality but I can see ways to improve if necessary!
- [x] All tests pass. Demo project builds and runs.
- [x] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/master/CONTRIBUTING.md)
Closes https://github.com/Instagram/IGListKit/pull/112
Differential Revision: D4066698
Pulled By: rnystrom
fbshipit-source-id: 64c5cc6f34cc9107f4f6e52ebc57596101eb695c