gulpfile.js

var gulp    = require('gulp'),
    connect = require('gulp-connect');

gulp.task('connect', function(){
  connect.server({
    root: 'app',
    livereload: true
  });
});

gulp.task('html', function () {
  gulp.src('app/**/*.html')
    .pipe(connect.reload());
});

gulp.task('watch', function () {
  gulp.watch(['app/**/*.html', 'app/**/*.js'], ['html']);
});

gulp.task('serve', ['connect','watch']);