updated maven repo versions

OLD
        <nd4j.version>0.0.3.5.3-SNAPSHOT</nd4j.version>
        <dl4j.version>0.0.3.2.5-SNAPSHOT</dl4j.version>
NEW
        <nd4j.version>0.0.3.5.4</nd4j.version>
        <dl4j.version>0.0.3.2.6</dl4j.version>