Add nfc lib
add lib dependency, update lib
Fixes
Update libs
Update lib
Merge branch 'master' into yubikey

Conflicts:
	.gitmodules
Merge branch 'master' into yubikey
NFC Yubikey: only pass through hash of message and not whole content
update nfc lib
Merge branch 'master' into yubikey
Fix test
Reuse signature creation timestamp for synchronous signing
Add values for NFC support
Cleanup
Remove support for V3 signatures
update lib
Merge branch 'master' into yubikey

Conflicts:
	.gitmodules
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/helper/Preferences.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedSecretKey.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/UncachedKeyRing.java
Merge branch 'master' into yubikey
Merge branch 'master' into yubikey

Conflicts:
	.gitmodules
	OpenKeychain/build.gradle
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java
	extern/openpgp-api-lib
	settings.gradle
Merge branch 'master' into yubikey

Conflicts:
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncrypt.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/PassphraseCacheService.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PreferencesActivity.java