3.10.1: restore `appToken` as a deprecated property

• Restore App Token as a deprecated property, so that existing card.io integrations will continue to build without modification.

3.10.0: Eliminate App Token. Also Icelandic!

• Eliminate App Token. Developers no longer need to sign up on the card.io site before using card.io.
• Add Icelandic (is) to our supported localizations. (Thank you, Martin Kaplan!)

3.9.0: add optional `preload` method to speed card.io launch

• Add new optional method preload to noticeably speed up the creation of your first CardIOView or CardIOPaymentViewController.

3.8.7: fix crash if user restricts your app's camera access

• Fix a crash that could occur if a user has restricted your app's camera access.

3.8.6: Xcode 6 (GM seed) build for iOS 8; should work with Xcode 5 or 6

• Solve (hopefully!) a build problem for Xcode 5 users. (see #66)

3.8.5: Xcode 6 (GM seed) build for iOS 8; fix a linker issue

NOTE: This one will work only for those of you who have updated to Xcode 6.

• Add armv7s slice (work around an Xcode 6 bug).

3.8.4: Xcode 6 (GM seed) build; update localized strings

NOTE: Due to a bug in Xcode 6 (regarding building armv7s slices), you should NOT use this release. Instead, please use version 3.8.5.

• Build with Xcode 6 GM seed.
• Update a few localized strings. (including: #65)

3.8.3: fix rare problem involving app caches directory getting cleared

• Fix a very rare problem involving the app caches directory getting cleared. (see paypal/PayPal-iOS-SDK#163)

3.8.2: fix some localization issues

• Fix some localization issues (see paypal/PayPal-iOS-SDK#164)

3.8.1: fix an iOS 8 (beta 2) crash

• Fix an iOS 8 (beta 2) crash.