code: public List<Version> getVersions(int projectID) throws RedmineException {
          return transport.getChildEntries(Project.class,
                  Integer.toString(projectID), Version.class);
      }
docs: delivers a list of {@link Version}s of a {@link Project}
  
  @param projectID the ID of the {@link Project}
  @return the list of {@link Version}s of the {@link Project}
  @throws RedmineAuthenticationException thrown in case something went wrong while trying to login
  @throws RedmineException        thrown in case something went wrong in Redmine
  @throws NotFoundException       thrown in case an object can not be found