* Runs the Swift 3 migrator in ChattoApp.
Affects ChattoApp, ChattoAppTests, Chatto and ChattoAdditions. Does not migrate ChattoTests or ChattoAdditionsTests
* Configures Chatto And ChattoAdditions projects to use Swift 3
* Updates .travis.yml to use Xcode 8 and iPhone 7
* Uses flatMap instead of filter and force cast
* Fixes createCollectionViewLayout not being a function
* Removes useless init overrides
* Fix for new implicit unwrapping optional non-propagation rule
* Removes useless casting
* Audits accessor levels in Observable
* Fixes UIControlState.Normal replaced by UIControlState()
* Favours private over fileprivate where possible
* Audits open/public access level
* Removes conditional if for Swift 2
* Removes label from simulateTapOnTextViewForDelegate
* Audits open/public access levels
Also allow user to override layoutConstants in
BaseMessageCollectionViewCell and allow user to specify
VerticalAlignment of avatar: Top, Bottom or Center
MessageModelProtocol should not require setter for status property.
MessageViewModelProtocol should not require messageModel property.
Both are convenience shortcuts for DemoChatApp and should be removed since they are not used by ChattoAdditions framework.
Diego Sánchez
Max Konovalov
Igor Kashkuta
Zhao Wang
Diego Sanchez