Added 'encoding' to README

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added 'key-generator' namespace

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added 'generate-keypair'

Signed-off-by: Sebastian Hoß <mail@shoss.de>
generate-key and generate-keypair accept a given instance of
SecureRandom

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Fixed reflection warnings

Signed-off-by: Sebastian Hoß <mail@shoss.de>