use https to fetch files from GitHub

see: https://github.com/blog/738-sidejack-prevention-phase-2-ssl-everywhere

[#6223 state:committed]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

railties/Rakefile

@@ -46,8 +46,8 @@ task :generate_guides do
 end
 
 task :update_ujs do
-  system "curl http://github.com/rails/prototype-ujs/raw/master/src/rails.js > lib/rails/generators/rails/app/templates/public/javascripts/prototype_ujs.js"
-  system "curl http://github.com/rails/jquery-ujs/raw/master/src/rails.js > lib/rails/generators/rails/app/templates/public/javascripts/jquery_ujs.js"
+  system "curl https://github.com/rails/prototype-ujs/raw/master/src/rails.js > lib/rails/generators/rails/app/templates/public/javascripts/prototype_ujs.js"
+  system "curl https://github.com/rails/jquery-ujs/raw/master/src/rails.js > lib/rails/generators/rails/app/templates/public/javascripts/jquery_ujs.js"
 end
 
 # Validate guides -------------------------------------------------------------------------