Only show keyrings that have a valid sign key in from field, fixes #756
Fix API version support, update api lib
Add convenience method to unified keyrings to determine whether a keyring is expired, fix is_revoked for certain usages
Only show relevant keys in encrypt, fix #756 #757
Merge pull request #758 from mar-v-in/encrypt-only-show-relevant-keys

EncryptActivity: only show relevant keys
update api lib
Fix DECRYPT_METADATA api
Merge branch 'master' into improve-contacts-more

Conflicts:
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/KeychainProvider.java