Bump up logback, janino, jetty

While combining an embedded neo4j-server 1.8.1 + logback 1.0.9 in our app we found incompatible dependency of both against janino's differing versions, hence we updated both logback and janino versions (taking into account the new janino's groupId), naking the dependency from logback-access 1.0.9 to jetty 7.x or 8.x, so we worked out the update of neo4j-server to use jetty 9 instead of 6.