Fix syntax error, alphabetize Gemfile, update docs

Managed to write the syntax wrong in one of the gulptasks which broke
everything and I made the gems listed in the Gemfile line up
alphabetically because I like it that way. Also updated the README that
gets generated with your project for the new commands.

generators/boilerplate/templates/README.md

@@ -5,26 +5,27 @@
 ## To get started
 
 ```sh
-$ gulp
+$ gulp [--prod]
 ```
 
 And you'll have a new Jekyll site generated for you and displayed in your
-browser. Neato.
+browser. Neato. If you want to run it with production settings, just add
+`--prod`.
 
 ## Usage
 
 ```sh
-$ gulp build
-```
-
-```sh
-$ gulp publish
+$ gulp build [--prod]
 ```
 
 ```sh
 $ gulp deploy
 ```
 
+## Github
+For more information on how to use your new project, please refer to the [README
+on Github](https://github.com/sondr3/generator-jekyllized).
+
 ## Owner
 
 > [<%= authorName %>](<%= projectURL %>)

generators/gulp/templates/gulpfile.babel.js

@@ -307,7 +307,7 @@ gulp.task('clean', gulp.series('clean:assets', 'clean:gzip'));
 // 'gulp rebuild' -- WARNING: Erases your assets and built site, use only when
 // you need to do a complete rebuild
 gulp.task('rebuild', gulp.series('clean:dist', 'clean:assets',
-'gulp clean:images', 'clean:metadata'));
+'clean:images', 'clean:metadata'));
 
 // 'gulp check' -- checks your Jekyll configuration for errors and lint your JS
 gulp.task('check', gulp.series('jekyll:doctor', 'lint'));

generators/jekyll/templates/Gemfile

@@ -6,10 +6,10 @@ gem 'classifier-reborn'
 
 # jekyll plugins
 gem 'jekyll-archives'
-gem 'jekyll-sitemap'
-gem 'jekyll-paginate'
 gem 'jekyll-feed'
 gem 'jekyll-gist'
+gem 'jekyll-paginate'
+gem 'jekyll-sitemap'
 
 # octopress
 gem 'octopress', '~> 3.0'