Merge pull request #522 from Valodim/master

show key expiry status similar to revocation
License clarification in README
Merge branch 'master' of github.com:open-keychain/open-keychain
Comment out localTest due to bug on windows
Fixed gradle localTest bug on Windows.
Merge pull request #529 from gogowitczak/gradlebug-branch

Fixed gradle localTest bug on Windows.
Futher Toast replacements in CertifyKeyActivity
Merge pull request #531 from danielhass/toast_replacement

Futher Toast replacements
Added possibility to enter custom key length. Added key length limitations, according to issue #102 and SpongyCastle specification.
Fixed coding style.
Merge pull request #536 from gogowitczak/custom-key-length

Added possibility to enter custom key length.
Update copyright timespan for Thialfihar
Change license from ASLv2 to GPLv3 where possible
Merge pull request #537 from thi/change-license-to-gpl

Change license to gpl
Introduce ProviderHelper.NotFoundException, remove dead code
Fix decryption of messages/files encrypted for multiple public keys
Use NotFoundException in more places
Modified Spinner values for CreateKeyDialog. Added info for user about custom key length restrictions.
Fix DECRYPT and SEND intent
KeychainIntentService instead of APG