Fixed config parameters for native-maven-plugin.

  - Testet with native-maven-plugin 1.0-alpha-8 and replaced
     s/outputDirectory/javahOutputDirectory/
     s/classNames/javahClassNames/
    in bluecove/pom.xml in order to work with OSX 10.9 and Maven 3
  - see https://code.google.com/p/bluecove/issues/detail?id=134#c33