Synced with latest changes (0.0.38)
 - use 3 less bytes for NFC bip38 to allow for smaller tags
 - BIP38 encryption for iOS
 - fixed BIP38 compressed sweeping on Android
 - Facebook login for iOS
 - Vouchers
 - 2FA and mnemonic verification warnings
 - bitcoin: URI support for iOS
 - display correct number of decimal places when converting currency to BTC/mBTC/uBTC
 - payment protocol support when scanning QR codes in 'Send Money'
 - display correct number of decimal places when converting currency to BTC/mBTC/uBTC
 - Android native PIN input
 - white background for iOS app icons
 - other minor improvements