templates.js

// Concatenate your partials and append them to index.html
gulp.task('templates', function() {

    var stream = streamqueue({objectMode: true});

    stream.queue(gulp.src([
        './src/layout/header.html',
        './src/layout/body.html'
    ]));
    stream.queue(gulp.src('./src/partials/**/*.html').pipe(partials()));
    stream.queue(gulp.src('./src/layout/footer.html'));

    return stream.done()
        .pipe(concat('index.html'))
        .pipe(gulp.dest('./build'))
        .pipe(livereload(server));
});