Swift 2.2 and Progress Closures

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Added

• The image/x-ms-bmp as an acceptable Content-Type.
  • Added by Guilherme Torres Castro in Pull Request
    #88.
• The ability to track download progress in the ImageDownloader as well as
  the UIButton and UIImageView extensions.
  • Added by Anthony Miller in Pull Request
    #91.
• The UIButton extension and tests to the tvOS targets.
  • Added by Christian Noon in Regards to Issue
    #94.

Updated

• The Alamofire submodule to the 3.3.0 release along with the Cartfile
  and Podspec dependencies.
  • Updated by Christian Noon.
• All source code, tests and example logic to use Swift 2.2 conventions.
  • Updated by Christian Noon.
• The required version of Xcode to 7.3 in the README.
  • Updated by Christian Noon.
• The AutoPurgingImageCache to purge cache during memory warnings on tvOS.
  • Updated by Christian Noon.
• Several Request and ImageDownloader tests on tvOS that were previously disabled.
  • Updated by Christian Noon.