version 0.14.0-SNAPSHOT, apparently 0.13 was released already

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
Fixed nullable SSLSocketFactory instantiation problem

Looks like sisu does not honour @Nullable annotation in some cases
(in this particualr case it was AetherRepositoryConnectorFactory
injected constructor parameter). As a workaround/solution, replaced
@Nullable with a Provider.

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
changed aether-util and guava dependency scope to compile

these are not exposed from maven core class realm and we fail with
class not found error when run as build extension.

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>