code: private void performVersionCodeUpdateFromVersion( Element manifestElement ) throws MojoExecutionException
      {
          String verString = project.getVersion();
          getLog().debug( "Generating versionCode for " + verString );
          String verCode = generateVersionCodeFromVersionName( verString );
          getLog().info( "Setting " + ATTR_VERSION_CODE + " to " + verCode );
          manifestElement.setAttribute( ATTR_VERSION_CODE, verCode );
          project.getProperties().setProperty( "android.manifest.versionCode", String.valueOf( verCode ) );
      }
docs: If the specified version name cannot be properly parsed then fall back to
  an automatic method.
  If the version can be parsed then generate a version code from the
  version components.  In an effort to preseve uniqueness two digits
  are allowed for both the minor and incremental versions.
  @throws MojoExecutionException