Added an `Avatar` property to the `AvatarView`
Replaced the `imageView` in the `MessagesCollectionViewCell` with the `AvatarView`
Moved the `Avatar.playground` to the example project so users can play around and learn it capabilities.
Updated the example project and abstracted the `sampleData` to its own file.
Updated the organization for the project to `MessageKit` instead of `Hex bits`
* Add AvatarView along with `AvatarView.Playground` Implemented code review changes.
* Add tests because your are supposed to add tests for everything.
* Replace references to the Avatar with AvatarView. Update Example Project.
* Updated my `swiftLint` and fixed issues.
MacmeDan
Steven Deutsch