1. Set .swiftlint.yml for ChatExample
2. Fix Access Control for Explicit Top Level ACL Violation
3. Fix SwiftLint Warning: Colon Violation, Function Body Length
4. Fix Forced Unwrapping style
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`
Changnam Hong
Federico Zanetello
Rich Gabrielli
Nathan Tannar
MacmeDan
Steven Deutsch
Jesse Squires