macOS OSLogWriter and ExecutionMethod

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Added

• A new .swift-version file for CocoaPods pointed at Swift 3.0.
  • Added by Christian Noon.
• A migration guide for the Willow 3.0 release.
  • Added by Christian Noon in Pull Request
    #21.
• Support for OSLogWriter on macOS 10.12+ by removing preprocessor guards.
  • Added by Silvan Mosberger in Pull Request
    #19.

Updated

• The Travis-CI YAML file to Xcode 8.2 and the latest SDKs and destinations.
  • Added by Silvan Mosberger in Pull Request
    #19.
• The Travis-CI YAML file by re-enabling pod lib lint since lint issue is resolved.
  • Updated by Christian Noon in Pull Request
    #21.
• The Xcode projects to Xcode 8.2 and disabled automatic signing on frameworks.
  • Updated by Christian Noon in Pull Request
    #21.
• Instances of OSX with macOS including the framework and target names.
  • Updated by Christian Noon in Pull Request
    #21.
• ExecutionMethod enum cases to be lowercased to match Swift API Design Guidelines.
  • Updated by Christian Noon in Pull Request
    #21.

Fixed

• Crash in WriterTests on iOS and tvOS 9 where os_log APIs are not available.
  • Fixed by Christian Noon in Pull Request
    #21.
• Compiler warnings in the example app around private and fileprivate ACLs.
  • Fixed by Christian Noon in Pull Request
    #21.