Some more documentation

Gemfile

@@ -107,6 +107,7 @@ group :development, :test, :assets do
   gem 'coffee-rails'
 
   # Use jquery as the JavaScript library
+	# Limited to before 4.1, because later version breaks the date/time selector
   gem 'jquery-rails', '< 4.1'
   # Turbolinks makes following links in your web application
   # faster. Read more: https://github.com/rails/turbolinks