Alamofire 3.0 and Request Receipts

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Added

• The AlamofireImage 2.0 Migration Guide and also added to the README.
  • Added by Christian Noon.
• A new RequestReceipt struct to the ImageDownloader to improve cancellation reasoning.
  • Added by Kevin Harwood.
• Cancellation tests to the ImageDownloader to validate new cancellation behavior.
  • Added by Christian Noon.
• Section to the README documenting the RequestReceipt usage.
  • Added by Christian Noon.

Updated

• Cartfile to pick up latest changes from the master branch of Alamofire 3.0.
  • Updated by Christian Noon.
• All source logic to use the Alamofire 3.0 APIs.
  • Updated by Christian Noon.
• All tests to compile and run against the Alamofire 3.0 APIs.
  • Updated by Christian Noon.
• All the sample code examples in the README to use all the new APIs.
  • Updated by Christian Noon.