gulp.task('copy-d2-source', ['clean-d2-source'], function () {
   return gulp.src(['../../d2-libs/d2/build/*'], {base: '../../d2-libs/d2/build'})
        .pipe(gulp.dest('jspm_packages/npm/d2'))
        .pipe(gulp.dest('jspm_packages/npm/d2@0.0.4'));
});