Xcode 9.3 and Swift 4.1

Released on 2018-03-31. All issues associated with this milestone can be found using this
filter.

Added

• Jazzy docs and configuration.
  • Added by Jon Shier in Pull Request #309.
• Ruby environment settings that match Alamofire's.
  • Added by Jon Shier in Pull Request #309.

Updated

• Project configuration and files for Xcode 9.3 and Swift 4.1.
  • Updated by Jon Shier in Pull Request #309.
• Copyrights to 2018 for all files.
  • Updated by Jon Shier in Pull Request #309.
• TravisCI configuration for Xcode 9.3.
  • Updated by Jon Shier in Pull Request #309.

Fixed

• Gravatar API usage in example code.
  • Fixed by Felipe Plets in Pull Request #298.