+ Created a new core interface (called RequestChainable) and applied it to most of the objects using a trait
+ Altered the `__construct()` and `fromJson()` methods of all model classes by replacing the second parameter ($apiRequester) with a $caller parameter
+ Altered the `__construct()` method of all requester classes to make them accept $client by reference instead of by value
+ Altered the `__construct()` method of all requester classes by replacing the second parameter ($authToken) with a $caller parameter
+ Changed the name of several methods and properties
+ Altered several docblocks
+ Created a Branch model class for storing branch data
+ Created a Tag model class for storing tag data
+ Created an Owner model class for storing owner data for branches
