code: public String getManifestAttribute(String attributeName) {
  	    if (attributeName != null) {
      	    Map<Object,Object> mf = getManifestAttributes();
              for (Object att : mf.keySet()) {
                  if (attributeName.equals(att.toString())) {
                      return mf.get(att).toString(); 
                  }
              }
  	    }
  	    
  	    //In case not found return null;
  	    return null;
  	}
docs: Retrieves a value for a specific manifest attribute.
  Or null if not found
  
  @param attributeName to locate in the manifest
  @return String value for or null case not found