Update card.io Android SDK to 5.4.0

[braebot]

• Android: Add ability to blur all digits in the scanned card image, minus any number of digits to remain unblurred, enabled via CardIOActivity.EXTRA_UNBLUR_DIGITS. (Thank you Michael Schmoock!)
• Android: Fix issue where Maestro cards were not correctly recognized #154.
• Android: Fix issue on Android 23 and above where CardIOActivity#canReadCardWithCamera() would return the incorrect value if permissions had not been granted #136. Now defaults to true in such cases.
• Android: Add missing locales to javadocs card.io-Android-source#75.
• Android: Upgrade gradle to 2.13.
• Android: Upgrade Android Gradle plugin to 2.1.0.

[jaypatel512]

You will need to add this flag inside the plugin code for Android and iOS

[braebot]

As discussed in person, the flag is only available in Android. Once it's available in iOS too, we can add it to the plugin code.