* [Swift] Update Alamofire version and update tests and Swift version to 4.2 for default and RxSwift variants
* Update promiseKit for Swift 4.0
* Update project files.
* Merge branch 'master' of https://github.com/OpenAPITools/openapi-generator into OpenAPITools-master
# Conflicts:
# samples/client/petstore/swift4/default/SwaggerClientTests/SwaggerClient.xcodeproj/project.pbxproj
* Merge in latest master
* Remove typo in bash file
Ensure the same date format string is used throughout the generated code (use the one set in Configuration.swift).
Ensure the same date formatter options are used when encoding dates as well as decoding dates. If a consumer has set their own date formatter on CodableHelper, use that when encoding dates too.
Adds DateFormatTests to the SWIFT4 unit tests.
Updates the SWIFT4 petstore samples
* update all swift samples
* fix method name starting with number literal
* better handling of operationId starting with number
* update swift 4 samples
