Add Angular to the gulp build

/// <binding AfterBuild='default' Clean='clean' />
/*
This file is the main entry point for defining Gulp tasks and using Gulp plugins.
Click here to learn more. http://go.microsoft.com/fwlink/?LinkId=518007
*/

var gulp = require('gulp');
var del = require('del');

var paths = {
  scripts: ['scripts/**/*.js', 'scripts/**/*.ts', 'scripts/**/*.map'],
  libs: ['node_modules/angular2/bundles/angular2.js',
       'node_modules/angular2/bundles/angular2-polyfills.js',
       'node_modules/systemjs/dist/system.src.js',
       'node_modules/rxjs/bundles/Rx.js']
};

gulp.task('lib', function () {
  gulp.src(paths.libs).pipe(gulp.dest('wwwroot/scripts/lib'))
});

gulp.task('clean', function () {
  return del(['wwwroot/scripts/**/*']);
});

gulp.task('default', ['lib'], function () {
  gulp.src(paths.scripts).pipe(gulp.dest('wwwroot/scripts'))
});