Added ability to set a URLSession on an APIObject.

Added decoder to APIObject initializer. Added tvOS to swift package a…

…nd podspec. Updated APIObjectConfiguration to be a singleton rather than static access.

Fixed DebugOptions to use appropriate bit shifted Int raw values.

- Fixed Bug where Global debug options might be ignored.

- Added a failureQueue so completions and failures can be returned on different queues.
- Added a cancel() function to APIObject.
- Added APIObject.failOnIgnorableError = false to ignore cancel errors when returned from a URLSessionTask.
- Add .printDeinitialization DebugOption that prints information about the APIObject when it is deinitialized.

Simplified Session structure to use URLSession.

Simplified decoding structure to use Swift's Decodable and Encodable.
Improved debug logging capabilities.

Added Apple Watch support starting at WatchOS 2.0.

Made HTTPURLResponse.successful() public. Updated version number to 0…

….3.2.

Made APIError initializer public. Updated version number to 0.3.1.

Updated for Swift 5.

Added URLResponse and raw Data? to APIError. Added SwiftLint.