2.12.9: Fix issue with determining valid negative amounts

• Fix issue determining valid negative amounts. See issue #369.

2.12.8: Code cleanup

• Update network code and general code cleanup

2.12.7: Fix iOS 7 Network Issue

• Update networking code for iOS 7 to fix potential ClassicURLConnection crash

2.12.6: Use shake animation to indicate bad PayPal login credentials

• When the wrong PayPal login credentials are used, use shake animation and allow user to login again without having to click on Pay button again

2.12.5: Add CocoaPods subspecs and update network code

• In CocoaPods, add subspecs to allow PayPal SDK to be used without card.io. By default, all libraries are included. If you do not want to use card.io, use the Core subspec like PayPal-iOS-SDK/Core in your Podfile. See the SampleApp without card.io to see how you can setup your application without credit card scanning. See issue #358.
• Update to use NSURLSession whenever possible. Falls back to NSURLConnection for iOS 6.

2.12.4: Split libraries to reduce individual file size, fix iOS 6 API availability issue

• Split card.io libraries into 3 different libraries to help reduce the size of the individual files. issue #339
  You should link to libPayPalMobile.a, libCardIO.a, libopencv_core.a, and libopencv_imgproc.a for your app now. See notes in 2.12.2 for more information.
• Fix issue with iOS 6 API availability with call to initWithBase64EncodedData:options: issue #351
• Switch to use vendored_libraries in PayPal-iOS-SDK.podspec to help some CocoaPod issues

2.12.3: Short description UI fix, cardIO dependency resolution improvement, update swift app to 2.0

• Fixed long string description text wrapping for iOS9, closes #322
• Updated Swift Sample App to Swift 2.0 syntax
• Fixed cocoapods spec file to unzip libCardIO.a.zip when installing for dependency resolution
• Parsing enhancement for empty response received from server APIs

2.12.2: Bitcode enablement, separate out card.io into own static lib

• There are now 2 static libraries which you should link to your application:
  • libPayPalMobile.a in the PayPalMobile directory
  • libCardIO.a in the CardIO directory. Please unzip the libCardIO.a.zip archive.
• libPayPalMobile.a is a required static library which has all the previous PayPal functionality using the REST APIs
• libCardIO.a is an optional static library. If you want to allow payments by scanning credit cards, you must also
  link this library. It is currently zipped in a libCardIO.a.zip file. Use a standard unzip tool to unzip
  CardIO\libCardIO.a.zip to get libCardIO.a.
• If you want the same functionality which you had before in version 2.12.1, link to both libPayPalMobile.a and
  libCardIO.a. You must use the libPayPalMobile.a and libCardIO.a from the same SDK.
• Bitcode enabled the libraries. While the static libraries are larger, the application delivered to users should not
  be significantly different in size compared to before. Issue #284
• You must use Xcode 7.0 with these versions of the SDK. For Xcode 6.4, you can use the 2.11.x libraries but it is
  advised that you upgrade as soon as possible. Xcode 6.4 is not compatible with Bitcode enabled libraries.

2.11.5: Fix issue with duplicate symbols

• Note this is the same code as 2.12.1 except built for Xcode 6.4 issue without Bitcode enabled #327
• Fix issue #320 with 2-Factor Authentication flow
• Add README note for URL schemes which the SDK queries
• Use SFSafariViewController via SafariServices.framework (if linked) for opening web pages
• Fixed behavior where retrieve_shipping_address is disabled and no shipping address is provided from the app, so it will not default to the PayPal account shipping address.

2.12.1: Fix issues with 2FA

• Fix issue with 2 Factor Authentication flow for issue #320
• Add note to README for URL schemes to add to LSApplicationQueriesSchemes for issue #324