Update to iOS 10

Merge pull request iZettle#316 from iZettle/sdk-release-v3.0.1

SDK Release v3.0.1

Merge pull request iZettle#301 from iZettle/fix-build-issue

Fix an issue where importing iZettleSDK from Swift files failed compilation

Merge pull request iZettle#286 from iZettle/sdk-release-v2.5.3

SDK Release v2.5.3

Fixed an issue where "iZettle SDK" might delete WebKit cookies on log…

…in and logout

Merge pull request iZettle#282 from iZettle/sdk-release-v2.5.1

SDK Release v2.5.1

Merge pull request iZettle#281 from iZettle/sdk-release-2.5.0

Updated v2.5.0 SDK binaries

Merge pull request iZettle#268 from iZettle/sdk-release-v2.3.2

SDK Release v2.3.2

Merge pull request iZettle#251 from iZettle/version_2.2

SDK version 2.2