update jekyll command

Author: mattmanning

lib/language_pack/ruby.rb

@@ -962,7 +962,7 @@ def run_assets_precompile_rake_task
 
   def generate_jekyll_site
     puts "Building jekyll site"
-    pipe("env PATH=$PATH bundle exec jekyll --no-server --no-auto 2>&1")
+    pipe("env PATH=$PATH bundle exec jekyll build 2>&1")
     unless $? == 0
       error "Failed to generate site with jekyll."
     end