Version 2.2

• Added upload(using:options:queue:uploadProgress:completionHandler:) taking one or multiple Uploadable items as input to Client and deprecated multiPartUpload(...) and multiFileUpload(...).
• Added equivalent new upload functionality for Objective-C that allows uploads of one or several local NSURL or NSData.
• Client upload functions now return types based on protocols, such as Uploadable, DeferredAdd, Cancellable, Monitorizable or combinations of these.
• Added UploadOptions class that allows customizing the upload behavior in a much more fine-grained way.
• Added CustomStringConvertible conformance to most public classes using newly added helper Tools.describe(subject:only:except:).
• Added static defaults function to StorageOptions defaulting to StorageOptions(location: .S3, access: .private).
• Removed unused storage property from Client and marked init(apiKey:security:storage:) as deprecated.
• Exposed more API to Objective-C.
• Updated Alamofire dependency to ~> 4.9.
• Updated CryptoSwift dependency to ~> 1.0.
• Improved documentation.