* Fix build error in Xcode 9 beta 3, as .compact is no longer defined
* Add test schema for Swift 4 and associated script and config files
* Add test app for swift4Test.json schema
* Make integer, Integer, int, and Int32 types map to Swift Int type instead of Int32 type
* Add CodingKeys to model template, which allows us to serialize/deserialize variable names that are different than property names
* Make updates to Swift 4 test schema
* Fixes for unit test app for swift4Test.json Swift 4 test schema
