3.8.0: Accept more card number prefixes; other small changes

• Accept Diners Club and China UnionPay card numbers as valid Discover card numbers.
• Allow manual entry of card numbers with unrecognized prefixes, as long as the card number passes the Luhn checksum test.
• Make zh-Hant_HK the default dialect for zh-Hant (Traditional Chinese). (zh-Hant_TW remains available, as well.)

3.7.1: Improve handling of Traditional Chinese

• Improve handling of Traditional Chinese. (github issue #47)

3.7.0: option to mask card digits during manual entry

• Add new maskManualEntryDigits property to CardIOPaymentViewController.
• Update PayPal logo.

3.6.5: add Thai localization

• Add Thai (th) to our supported localizations.

3.6.4: data-entry - automatically enter text-editing mode

• When the data-entry screen appears, automatically enter text-editing mode. (github issue #41)

3.6.3: reenable disableManualEntryButtons feature

• Repair the disableManualEntryButtons property. (github issue #38)

3.6.2: fix an orientation glitch when no camera is available

• Fix an orientation glitch when no camera is available.

3.6.1: fix a compiler bug

• Fix a compiler issue caused by a change in header file import ordering.

3.6.0: better support for device rotation

• New appearance of the "Cancel" and "Enter Manually" buttons in camera view, including automatic button rotation to match device orientation.
• New property, allowFreelyRotatingCardGuide, for both CardIOPaymentViewController and CardIOView; provides the option to constrain camera-view UI rotation to follow standard iOS behavior.
• The manual entry screen now includes a landscape orientation.

3.5.0: option to suppress final card image

• Add suppressScannedCardImage property to CardIOPaymentViewController (github issue #33)